Peter Attia Podcasts - Transcripts / Analysis

#1

The ketogenic diet, ketosis, and hyperbaric oxygen: weight loss, cognition, cancer, and more

AI summary:

Based on the transcript provided featuring Dom D’Agostino and Peter Attia, here is the summary and analysis.

A. Executive Summary

In this episode of The Drive, Peter Attia and Dr. Dom D’Agostino discuss the evolution of the ketogenic diet from a niche epilepsy treatment to a broad metabolic therapy for neurodegenerative diseases, cancer, and performance enhancement. D’Agostino details his background in Navy-funded research on oxygen toxicity seizures, which identified ketones as a neuroprotective fuel source superior to glucose in extreme environments.

The conversation pivots to the practical application of ketosis. D’Agostino argues against the “low protein” dogma of early ketogenic diets, advocating for high protein intake to prevent sarcopenia, especially in aging populations. He provides a critical analysis of exogenous ketones, distinguishing between first-generation esters (effective but potentially toxic or unpalatable) and modern ketone salts (balanced electrolytes, racemic mixtures).

Crucially, the dialogue covers the “metabolic therapy framework” for Glioblastoma Multiforme (GBM) and Alzheimer’s disease. D’Agostino posits that while standard of care for GBM fails, a “press-pulse” strategy targeting glucose and glutamine alongside ketosis shows promise in pre-clinical models. He concludes with an update on Hyperbaric Oxygen Therapy (HBOT) for TBI and the emerging use of ketogenic therapies for psychiatric disorders like anorexia and schizophrenia.

B. Bullet Summary

  • Original Research Context: D’Agostino’s interest in ketones originated from Department of Defense (DoD) research into preventing oxygen toxicity seizures in Navy SEALs using closed-circuit rebreathers.
  • Epilepsy Efficacy: The ketogenic diet renders ~66% of drug-resistant pediatric epilepsy patients responsive; ~33% achieve complete seizure control.
  • Protein Misconceptions: Standard ketogenic advice often restricts protein too severely. D’Agostino recommends higher protein (up to 1g/lb or ~2.2g/kg) to maintain muscle mass, noting that gluconeogenesis rarely kicks one out of ketosis in active individuals.
  • Ketone Biometrics: Blood testing remains the gold standard. Breath acetone meters have improved (e.g., Keto Air), but urine strips remain imprecise.
  • Carnivore Diet: Viewed clinically as a strict elimination diet beneficial for autoimmune disorders (e.g., vitiligo, RA) rather than a magic metabolic hack; it functions as a subset of the ketogenic diet.
  • 1,3-Butanediol Risks: This alcohol-based ketone precursor can elevate liver enzymes and cause intoxication (resembling ethanol toxicity) at high doses required for therapeutic ketosis.
  • Racemic Ketone Salts: D’Agostino advocates for racemic salts (containing both D- and L-BHB). While D-BHB is oxidized for fuel (ATP), L-BHB acts as a signaling molecule (suppressing NLRP3 inflammasome, epigenetic modulation).
  • Energy Toxicity: Exogenous ketones should not raise levels significantly above 2-3 mmol/L in the presence of high glucose, as this can cause counter-regulatory insulin spikes and acidic blood pH (energy toxicity).
  • Alzheimer’s Mechanism: The brain exhibits glucose hypometabolism (Type 3 Diabetes) decades before cognitive decline; ketones bypass this defect as they use a different transporter (MCT) and pathway.
  • Cancer Strategy: For Glioblastoma, a “Press-Pulse” strategy is proposed: maintain a Glucose-Ketone Index (GKI) of 1-4 (Press) and intermittently use drugs to block glutamine/glucose (Pulse).
  • Lack of Cancer RCTs: Despite strong mechanistic and animal data, no Randomized Controlled Trials (RCTs) yet prove the metabolic therapy framework extends survival in human GBM patients.
  • Psychiatric Applications: Emerging trials (funded by the Baszucki Group) suggest ketogenic efficacy in bipolar disorder, schizophrenia, and paradoxically, anorexia nervosa (by reducing hedonic food anxiety).
  • Hyperbaric Oxygen (HBOT): Likely effective for acute TBI/concussion (first 48-72 hours). Evidence for chronic/old TBI is evolving, with a major DoD sham-controlled study currently underway at USF.
  • Actionable Supplementation: Electrolyte-bound ketone salts (e.g., Keto Start) mitigate the “keto flu” (caused by natriuresis) and provide a non-insulin-spiking fuel source.

D. Claims & Evidence Table

Claim Evidence Provided Assessment
Ketogenic diet controls drug-resistant epilepsy. Cited historical Mayo Clinic data (1920s) and modern clinical stats: 2/3rds of drug-resistant pediatric patients respond. Strong (Consensus medical fact).
1,3-Butanediol causes liver stress/intoxication. D’Agostino’s lab data showing elevated transaminases; Attia’s anecdotal experience; mechanistic analogy to ethanol metabolism (alcohol dehydrogenase pathway). Strong/Mechanistic (Biochemically sound).
Metabolic therapy (Keto + Drugs) extends survival in Glioblastoma (GBM). Citations of Thomas Seyfried’s work; animal models showing tumor suppression; anecdotal case reports. Explicitly noted lack of RCTs. Speculative/Pre-clinical (Unproven in humans via RCT).
Racemic Ketone Salts (D+L BHB) offer superior signaling. Mechanisms cited: L-BHB persists longer in plasma and inhibits NLRP3 inflammasome/HDACs better than D-BHB (which is rapidly burned). Strong (Supported by mechanistic literature).
Anorexia Nervosa responds to Ketogenic Diet. Cited ongoing studies by Guido Frank (UCSD) and others; anecdotal reports of remission potentially due to altered neuropharmacology/hedonic response. Emerging/Counter-intuitive (Needs robust trial data).
High protein intake kicks you out of ketosis. D’Agostino refutes this based on personal data (eating ~220g protein/day) and metabolic flexibility in active individuals. Context-Dependent (True for sedentary, false for active/metabolically flexible).

E. Actionable Insights

  1. Prioritize Protein Over Fat Ratios: If using a ketogenic diet for body composition or longevity, do not restrict protein to 0.8g/kg. Aim for ~1g per pound of body weight (or ~2.2g/kg) to prevent muscle loss, using fat only to fill remaining caloric needs.
  2. Mitigate “Keto Flu” with Electrolytes: The transition to ketosis causes sodium excretion (natriuresis). Supplement with sodium, potassium, and magnesium—ideally bound to ketone salts (e.g., Keto Start)—to bridge the energetic gap and prevent fatigue.
  3. Target GKI for Therapeutic Outcomes: For managing cancer or seizures, use a Glucose Ketone Index (GKI) of 1–4. For general health/weight loss, simple carbohydrate restriction and mild ketosis (0.5–1.0 mmol/L) are sufficient.
  4. Avoid High-Dose 1,3-Butanediol: For longevity and liver health, avoid relying on high doses of 1,3-butanediol or “jet fuel” esters that induce intoxication. Stick to ketone salts or MCT oil blends.
  5. Acute Concussion Protocol: In the event of a concussion, immediate implementation of a ketogenic state (via exogenous ketones) combined with Hyperbaric Oxygen Therapy (if accessible) within the first 72 hours may be neuroprotective.
  6. Use CKM or Blood Testing: Urine strips are inaccurate for long-term use. Use a Continuous Ketone Monitor (CKM) or finger-stick blood meter (e.g., Keto Mojo) to correlate specific foods with ketone inhibition.
  7. Strategic Fasting: Instead of chronic caloric restriction, use situational fasting (e.g., during travel, high cognitive demand work, or inflammation flare-ups) to reset metabolic parameters and lower inflammation.

H. Technical Deep-Dive

1. The Biochemistry of Racemic Ketone Salts (D- vs. L-BHB)
Most commercial ketone research focuses on the D-isoform (R-3-hydroxybutyrate) because it is the primary substrate for ATP generation via the TCA cycle. However, D’Agostino highlights the utility of Racemic mixtures (DL-BHB) found in specific salts.

  • Metabolism: D-BHB is rapidly oxidized by tissues (heart, brain, muscle), causing plasma levels to spike and drop quickly. L-BHB is not a direct fuel substrate; it must be isomerized or metabolized slowly.
  • Signaling: Because L-BHB lingers in the plasma (slower clearance), it acts as a potent signaling molecule. It functions as a Histone Deacetylase (HDAC) inhibitor (increasing FoxO3a expression for stress resistance) and suppresses the NLRP3 Inflammasome (a multiprotein oligomer responsible for activation of inflammatory responses).
  • Conclusion: While D-BHB provides energy, the L-isoform provides the anti-inflammatory and epigenetic “drug-like” benefits of ketosis.

2. Oxygen Toxicity & Ketone Neuroprotection

  • Mechanism of CNS Oxygen Toxicity: High partial pressures of oxygen (Hyperoxia) increase Reactive Oxygen Species (ROS), which deactivate the enzyme Glutamic Acid Decarboxylase (GAD).
  • The Seizure Pathway: GAD is responsible for converting Glutamate (excitatory) into GABA (inhibitory). When ROS inhibits GAD, Glutamate accumulates and GABA depletes, leading to hyperexcitability and seizures.
  • Ketone Intervention: Ketosis increases the production of Adenosine (neuroprotective) and preserves GABAergic tone, effectively raising the threshold for seizures even in the presence of high oxidative stress.

I. Fact-Check Important Claims

  • Claim: Standard American Diet (SAD) produces a GKI of 40-50, while therapeutic ketosis is 1-4.
    • Verification: Accurate. A typical non-diabetic glucose level is ~90-100 mg/dL (~5.0-5.5 mmol/L). On a SAD, ketones are ~0.1 mmol/L. GKI = Glucose/Ketone = 5.5/0.1 = 55. Therapeutic ketosis targets Glucose ~3.5 mmol/L and Ketones ~3.5 mmol/L, yielding a GKI of ~1.
  • Claim: No FDA indications for Hyperbaric Oxygen in TBI.
    • Verification: True. There are 14 FDA-approved indications for HBOT (e.g., wound healing, decompression sickness, carbon monoxide poisoning), but Traumatic Brain Injury (TBI) is not currently one of them, making its use “off-label.”
  • Claim: NAD precursors (NR/NMN) have largely failed in clinical trials for longevity.
    • Verification: Mostly True. While animal data is robust, human trials for NR/NMN have shown bioavailability issues and inconsistent results regarding meaningful clinical endpoints (e.g., muscle insulin sensitivity, longevity biomarkers), though some safety and minor metabolic benefits have been observed. D’Agostino suggests stabilized NAD formulations may be required.

Here is the comparison table of the specific Ketone Salt brands and their electrolyte compositions based on the available data.

Ketone Salt & Electrolyte Brand Comparison

Brand Product BHB Amount BHB Form Electrolyte Profile (Per Serving) Key Features
Audacious Nutrition KetoStart 10 g Racemic (D+L) Total Electrolytes: ~1,000 mg
(Balanced mix of Sodium, Potassium, Calcium, Magnesium) 		• Formulation: Designed by Dr. Dom D’Agostino.
• Racemic: Contains L-BHB for signaling (anti-inflammatory) & D-BHB for fuel.
• Ratio: Higher BHB load (10g) with a balanced electrolyte spread to prevent GI distress.
KetoLogic Keto BHB 6 g goBHB® (Typically Racemic) Sodium: 510 mg
Calcium: 260 mg
Potassium: 200 mg
Magnesium: 75 mg		 • Sodium-Heavy: Relies heavily on sodium for the salt bond.
• Lower BHB: Contains nearly half the BHB of KetoStart per serving.
Perfect Keto Exogenous Ketone Base 11.3 g goBHB® (Racemic) Sodium: ~600–900 mg*
Calcium: ~600 mg*
Magnesium: ~350 mg*
(Exacts vary by flavor) 		• High Mineral Load: Often uses a split of Calcium/Magnesium/Sodium salts.
• Warning: High Calcium/Magnesium content can cause GI distress in some users compared to sodium-balanced formulas.
Prüvit Keto OS NAT Proprietary (Est. 7–9g) Fermented D-BHB (R-Only) Sodium: Unlisted (Proprietary)
Calcium: Unlisted (Proprietary)
Magnesium: Unlisted (Proprietary)		 • Proprietary Blend: Does not disclose exact electrolyte or BHB amounts.
• Form: Uses “Naturally Fermented” D-BHB (Bio-identical), lacking the L-isomer found in racemic salts.
LMNT Recharge 0 g N/A (Electrolytes Only) Sodium: 1,000 mg
Potassium: 200 mg
Magnesium: 60 mg		 • Electrolyte Standard: Often used alongside ketones or for “Keto Flu” mitigation.
• No Ketones: Strictly for hydration/mineral replenishment.

Analysis of Composition

  • Racemic vs. D-BHB:

    • KetoStart (Audacious) and Perfect Keto use Racemic salts (D+L). As Dom noted, this provides the D-isoform for immediate fuel (ATP) and the L-isoform as a signaling molecule (lowering inflammation/oxidative stress) that lingers in the blood longer.
    • Prüvit markets “Bio-identical” D-BHB (R-isoform only). While this mimics the ketone body produced by the liver for fuel, it misses the potential signaling benefits of the L-isoform discussed in the interview.

  • Electrolyte Load & “Keto Flu”:

    • KetoStart and LMNT mimic a similar ~1g electrolyte load, but KetoStart attaches those electrolytes to actual Ketones (BHB).
    • KetoLogic relies heavily on Sodium (510mg) and Calcium but has a lower total BHB dose (6g), which may be less effective for therapeutic ketosis compared to the 10g+ doses found in KetoStart or Perfect Keto.

  • Transparency:

    • Audacious, KetoLogic, and LMNT are generally transparent about their “Amount Per Serving.”
    • Prüvit uses a “Proprietary Blend” model, making it impossible to know if you are consuming enough BHB for a therapeutic effect or if the salt load is dangerously high for salt-sensitive individuals.
1 Like
#2

Training for longevity: A roundtable on building strength, preventing injury, protein, & more

AI Summary:

Resistance Training, Longevity, and Muscle-Centric Medicine: Roundtable Analysis

A. Executive Summary

This roundtable discussion, hosted by Peter Attia, features three distinct experts in human performance: Dr. Gabrielle Lyon (Geriatrics and Nutritional Sciences), Mike Boyle (Strength and Conditioning Coach), and Jeff Cavaliere (Physical Therapist and founder of Athlean-X). The core thesis is that skeletal muscle is the organ of longevity, yet the majority of the population fails to engage in the resistance training necessary to maintain it. The conversation dismantles the traditional “powerlifting” dogma (squat, bench, deadlift) as the only path to strength, arguing instead for risk-managed, longevity-focused training protocols that prioritize consistency over intensity.

A significant portion of the dialogue focuses on the risk-reward trade-off of heavy spinal loading as one ages. Both Boyle and Attia argue that bilateral back squats and heavy deadlifts become orthopedically expensive for the aging individual, advocating for unilateral (single-leg) training which bypasses the “bilateral deficit” and reduces spinal compression. Dr. Lyon provides the metabolic context, defining muscle not just as a contractile tissue but as a metabolic sink for glucose and a predictor of survivability against chronic disease.

The group also addresses the crisis of youth sports specialization, agreeing that early hyper-focus on single sports leads to increased injury rates and burnout. Conversely, they argue for “sampling” (playing multiple sports) to build general athleticism. Finally, the discussion pivots to practical longevity strategies: prioritizing protein intake (minimum 100g/day), eliminating biomechanically compromised exercises (the “Iron Graveyard”), and training proprioception (balance) to prevent falls—the leading cause of catastrophic decline in the elderly.

B. Bullet Summary

  • Muscle as the Organ of Longevity: Skeletal muscle is the primary site for glucose disposal and metabolic regulation; its degradation (sarcopenia) is a primary driver of aging and chronic disease.
  • The Bilateral Deficit: Individuals often possess greater cumulative strength on single legs (left + right) than on both legs simultaneously due to neurological inhibition during bilateral lifts.
  • Unilateral Superiority: Single-leg training (e.g., Bulgarian split squats) stimulates high-threshold motor units and hypertrophy without the compressive spinal load of heavy back squats.
  • The “Iron Graveyard”: Certain exercises have a poor risk-to-reward ratio and should be abandoned, specifically upright rows (shoulder impingement risk) and unsupported chest flys (anterior capsule stress).
  • Nutrition Drives Composition: Leanness is achieved primarily through caloric control and nutrition, while training provides the stimulus for muscle growth; you cannot “out-train” a diet deficient in protein or excessive in calories.
  • Anabolic Resistance: As humans age, the efficiency of protein utilization drops. Older adults require higher protein intakes (specifically Leucine) to trigger muscle protein synthesis compared to adolescents.
  • Minimum Protein Threshold: A baseline of 100g of high-quality protein daily is recommended for all adults, regardless of sex, to support tissue turnover and muscle maintenance.
  • Youth Specialization Fallacy: Early sports specialization (pre-puberty) correlates with higher injury rates and lower long-term athletic success compared to a “sampling” period of multiple sports.
  • Proprioception Decay: Balance and reaction time degrade with age. Training balance with eyes closed is essential to prevent falls, as most falls occur in low-light conditions where visual feedback is absent.
  • Achilles Tendon Vulnerability: The Achilles is a common failure point in aging athletes; prevention requires soleus-specific stretching/rolling and ankle mobility work.
  • Consistency over Intensity: For the general population, the barrier to entry is often psychological (“it must be hard”). Consistency (attendance) yields better long-term results than sporadic high-intensity efforts.
  • Intermuscular Adipose Tissue (IMAT): IMAT (fat infiltration within the muscle) is likely a more accurate predictor of metabolic dysfunction and insulin resistance than BMI or total body fat percentage.

D. Claims & Evidence Table

Claim Made Evidence Provided Assessment
Bilateral Back Squats are unnecessary for hypertrophy/strength. Boyle cites athlete data showing split-squat loads equal to front squat loads; Attia cites personal injury history and “bilateral deficit” neurology. Strong. Supported by biomechanical research on bilateral deficit and electromyography (EMG) studies on unilateral training.
Protein intake must be at least 100g/day. Dr. Lyon cites turnover rates of visceral tissue and the requirement of essential amino acids (specifically Leucine) to trigger mTOR in aging muscle. Strong. Aligns with current protein research suggesting 1.2–1.6g/kg for preventing sarcopenia.
Upright Rows cause shoulder impingement. Cavaliere cites biomechanics: internal rotation combined with elevation compresses the supraspinatus tendon against the acromion. Strong. Widely accepted in physical therapy and orthopedics; known mechanism for subacromial impingement.
Early sports specialization leads to higher injury rates. Boyle cites observations of overuse injuries in youth and “early succeeder” phenomenon; Lyon notes lack of injury reduction despite “advancements.” Strong. Supported by data from the American Medical Society for Sports Medicine and pediatric orthopedics.
Eating after 6 PM causes fat gain. Cavaliere refutes this, stating total caloric intake and protein consistency determine body composition, not meal timing. Strong. Thermodynamics and metabolic ward studies confirm total energy balance trumps meal timing for weight loss.
IMAT is a better predictor of disease than Body Fat %. Dr. Lyon cites clinical experience and emerging literature linking muscle fat infiltration to insulin resistance (e.g., PCOS). Speculative/Emerging. Strong theoretical basis, but DEXA/BMI remain the clinical standard due to cost/access of MRI/CT needed to measure IMAT.

E. Actionable Insights

  1. Switch to Unilateral Lower Body Training: Replace heavy spinal loading (back squats) with rear-foot elevated split squats (Bulgarian split squats) or reverse lunges. This maintains leg strength while sparing the lumbar spine.
  2. Audit Your “Iron Graveyard”: Immediately stop doing Upright Rows and unsupported Dumbbell Chest Flys. Replace them with High Pulls (external rotation focus) and Floor Flys (to limit range of motion and protect the shoulder capsule).
  3. Protein “Bookending”: Aim for a minimum of 30-50g of protein at the first and last meal of the day to ensure you hit the >100g daily floor. Focus on leucine-rich sources (animal products or fortified plant sources).
  4. The “Eyes Closed” Balance Drill: Practice standing on one leg with eyes closed to train proprioceptive systems independent of vision. This mitigates fall risk as reaction times slow with age.
  5. Soleus Care for Achilles Health: Perform aggressive foam rolling on the calf and specific soleus stretching (knee bent) to reduce tension on the Achilles tendon, especially if engaging in dynamic sports (pickleball, tennis).
  6. Use the “Standing Cable Press”: If you have shoulder pain or labral issues, utilize the standing cable press. It allows for a functional pressing pattern without the fixed-path impingement of machines or bench pressing.
  7. Gamify Fitness for Kids: Do not impose structured “sets and reps” on pre-pubescent children. Use games (e.g., card games dictating movements) to build motor patterns without the psychological burden of “training.”
  8. Widen Your Lunge Stance: When performing lunges, step out slightly to the side (not walking a tightrope) and rotate the torso slightly over the front leg to lock the hip into a stable position.
  9. Hydration and Fiber Audit: Following Boyle’s advice post-surgery, assess fiber intake and hydration status. Digestive health is often the silent point of failure in the 50+ demographic.

H. Technical Deep-Dive

1. The Bilateral Deficit and Neural Drive
The “Bilateral Deficit” (BLD) refers to the phenomenon where the maximal force produced by two limbs acting simultaneously is less than the sum of the forces produced by each limb acting individually ($F_{bilateral} < F_{left} + F_{right}$).

  • Mechanism: The primary driver is neurological inhibition. During bilateral exertion, the central nervous system (CNS) reduces neural drive to the motor units to maintain stability and protect the spine. Unilateral training bypasses this inhibition, allowing for higher motor unit recruitment in the target muscle group without the systemic fatigue or spinal shear forces associated with maximal bilateral loading.
  • Application: For longevity, this allows an individual to overload the quadriceps or glutes with high intensity while subjecting the lumbar vertebrae to significantly lower compressive forces.

2. Anabolic Resistance and Leucine Thresholds
Dr. Lyon references “Anabolic Resistance,” the age-related reduction in the skeletal muscle’s sensitivity to dietary amino acids and insulin.

  • mTORC1 Pathway: Muscle Protein Synthesis (MPS) is regulated by the mechanistic target of rapamycin complex 1 (mTORC1). In youth, insulin and low doses of amino acids easily trigger this pathway.
  • Aging Physiology: As tissues age, the “leucine threshold” required to trigger mTORC1 increases. While a child might trigger growth with 5g of protein, an older adult may require 2.5g to 3g of Leucine (approx. 30g of high-quality animal protein) in a single bolus to initiate the same anabolic response. This validates the recommendation for fewer, larger protein feedings rather than “grazing” on sub-threshold amounts.

3. Intermuscular Adipose Tissue (IMAT)
Distinct from subcutaneous fat (under skin) and visceral fat (around organs), IMAT is the infiltration of adipocytes between muscle fibers.

  • Pathology: High IMAT levels correlate strongly with insulin resistance. When fat infiltrates muscle tissue, it disrupts the insulin signaling cascade (PI3K/Akt pathway), preventing efficient glucose uptake (GLUT4 translocation). This renders the muscle—the body’s largest glucose disposal agent—metabolically inflexible, contributing to Type 2 Diabetes independent of total body mass.

I. Fact-Check Important Claims

Claim: 50% of Americans are not training or doing any kind of exercise.

  • Verification: True. According to CDC data (National Health Interview Survey), only ~24-28% of U.S. adults meet the combined aerobic and muscle-strengthening guidelines. Approximately 46-50% fail to meet either guideline significantly.

Claim: Kids who specialize early have higher injury rates.

  • Verification: True. A study published in the American Journal of Sports Medicine (2015) found that young athletes who specialized in a single sport were 81% more likely to experience overuse injuries compared to those who played multiple sports.

Claim: Upright Rows are dangerous for the shoulder.

  • Verification: Consensus Supported. The internal rotation required during an upright row places the greater tuberosity of the humerus in a position that reduces the subacromial space, compressing the supraspinatus tendon. Chronic repetition significantly increases the risk of subacromial impingement syndrome (SAIS).

Claim: You cannot out-train a bad diet (regarding body composition).

  • Verification: True. While exercise creates a caloric deficit, the compensatory mechanisms (increased appetite, non-exercise activity thermogenesis reduction) often offset exercise calories. A systematic review in Systematic Reviews (2014) confirms that exercise alone results in minimal weight loss without dietary intervention.
#3

I think applying protein intake to weight makes no sense.
We need a more precise recommendation.

Adults (of either sex) can have a >100 lb difference in weight and some significant percentage of that difference in lean body mass (LBM).

Alternative

Shouldn’t we scale protein intake to LBM or perhaps better, desired LBM?

Essentially eat enough protein to support:

  • Targeted/desired lean body mass
  • Activity (daily calorie burn)
  • Demands of your training (repair and muscle growth)

LBM recommendations

One comes across recommendations taking into account LBM to aim for 1 to 2 grams of protein per kilogram or 0.5 to 1 gram per pound of LBM.

This seems like a ridiculously broad range.

Example

Male weighing 194 lbs with 16% body fat.
This yields ~31 lbs of body fat or 163 lbs LBM.

So 82 grams to 163 grams of protein per day (note: corrected from my original post).
This would give one a protein calorie range of 328 calories to 652 calories (figuring 4 calories per gram of protein)

This kind of range seems nuts.
What have I missed?

Does anyone have a more precise guideline so that we can optimize protein intake?

#4

I couldn’t find all of the brands mentioned, but I did ask ChatGPT5 to analyze the ingredients of three popular BGB powders.

Final ranking (for real ketosis):

:1st_place_medal: Nutricost Keto BHB – best ketone delivery: Racemic (D + L)
:2nd_place_medal: goBHB Clean Energy – mild, clean, but weak: Racemic (D + L)
:3rd_place_medal: Perfect Keto – too mineral-heavy, inefficient: Racemic (D + L)

C8 MCT oil: Not chiral (no D/L issue)

I am using pure C8 MCT oil. Because of my diet and eating window I am almost always in morning ketosis. I have a blood ketone test meter. I quit using it because I was always in morning ketosis.

1 Like
#5

@Alpha

If you like/respect Stu Phillips, the other day I shared his response to my question if guidance for protein intake should be based on lean mass vs total body weight. I asked because in an Attia podcast, Rhonda Patrick said it was ideally on lean mass.
I did not ask him to address the question if one were morbidly obese. I imagine that answer might be slightly different.

He said:

Thanks for your thoughtful question! You’re absolutely right that older adults and those following a vegan diet, benefit from being toward the higher end of the protein range, so 1.6 g/kg is a good target.

As for whether to use total body weight or lean mass: most guidelines and research use total body weight because it’s practical and consistent. Using lean mass can make sense conceptually, but it’s not widely adopted in recommendations because lean mass measurements aren’t always available or standardized (or that good if you use a bathroom scale-type ‘body composition’ monitor). If you’re already hitting 1.6 g/kg based on lean mass, that’s great—but if you calculate based on total weight, you’ll ensure you’re meeting the evidence-based target.

Bottom line: stick with 1.6 g/kg of total body weight for simplicity and reliability.

2 Likes
#6

Brain lipidology: understanding APOE, cholesterol homeostasis, Alzheimer’s disease, & more

I. Executive Summary

The core thesis of this clinical discussion centers on the absolute compartmentation of brain cholesterol homeostasis from peripheral lipid metabolism, and the profound therapeutic implications this separation holds for neurodegenerative disease prevention. Systemic apolipoprotein B (ApoB) and apolipoprotein A1 (ApoA1) particles are structurally excluded by the tight junctions of the blood-brain barrier (BBB). Consequently, the adult central nervous system relies entirely on autonomous de novo cholesterol synthesis. While peripheral tissues predominantly utilize the lathosterol pathway, adult brain cells synthesize cholesterol via the alternative Bloch pathway, utilizing desmosterol as the critical penultimate precursor.

Neurons downregulate their own energy-expensive cholesterol synthesis around age 10 to preserve metabolic adenosine triphosphate (ATP) for action potentials and synaptic transmissions, as synthesizing a single molecule of cholesterol demands over 30 molecules of ATP across a complex 37-step pathway. Post-developmental brains shift this lipid manufacturing burden to astrocytes. Astrocytes package synthesized cholesterol into apolipoprotein E (ApoE) containing high-density lipoprotein (HDL)-like particles, which are secreted into the matrosome (extracellular matrix) and subsequently cleared by neuronal low-density lipoprotein (LDL) receptors and LDL receptor-related protein 1 (LRP1).

Pathology arises when localized lipid clearance kinetics are disrupted, a state heavily driven by the inheritance of the APOE4 allele. The single amino acid substitutions characterizing the ApoE4 protein alter its confirmation and diminish its binding affinity for neuronal receptors, trapping cholesterol within the neuronal cell membrane while starving the intracellular cytosol. This membrane cholesterol overload forces amyloid precursor protein (APP) into specialized lipid rafts where beta- and gamma-secretases preferentially cleave it into neurotoxic amyloid-beta 42, rather than the benign, non-aggregating amyloid-beta 40 isoform generated by alpha-secretase under normal lipid conditions. To protect against intracellular lipid crystallization and subsequent apoptosis, distressed neurons express 24S-hydroxycholesterolase to convert excess cholesterol into the highly hydrophilic oxysterol 24S-hydroxycholesterol, which readily crosses the BBB into systemic plasma for hepatic elimination via bile acids.

Pharmacological targeting of this axis reveals distinct translational barriers and opportunities. While standard lipid-lowering therapies act exclusively in the periphery, statins cross the BBB at steady state to inhibit central HMG-CoA reductase. While major trials indicate cognitive neutrality or long-term benefit, excessive central suppression can cause acute, reversible cognitive deficits (“brain fog”), which can be mitigated by keeping plasma desmosterol levels above 0.8 to 1.0 mg/L. Ezetimibe’s glucuronidated metabolite also crosses the BBB, showing preclinical efficacy in disrupting the pathological hexokinase-1::14-3-3G protein interface to trigger autophagic clearance of aggregates. Most remarkably, novel data from the cholesteryl ester transfer protein (CETP) inhibitor obicetrapib demonstrates a robust, placebo-adjusted 20.48% reduction in plasma p-tau217 alongside significant drops in NfL and GFAP among APOE4/E4 homozygotes. This effect is achieved because systemic CETP inhibition induces hepatic overproduction of ApoA1, which crosses the BBB to structurally rescue dysfunctional ApoE4 central lipid particles.

II. Insight Bullets

  • Absolute Cellular Autonomy: Every individual cell in the human body possesses the evolutionary machinery to synthesize its own structural cholesterol de novo to maintain membrane integrity.
  • Crystallization Toxicity: Intracellular accumulation of cholesterol exceeding precise physiological thresholds triggers intracellular crystallization, inducing severe cellular toxicity and apoptosis.
  • Dual-Route Systemic RCT: Systemic reverse cholesterol transport (RCT) operates via a direct route (HDL transporting mass to the liver) and an indirect route (HDL transferring mass to ApoB particles for hepatic receptor clearance).
  • LDL as a Return Vessel: The physiological purpose of low-density lipoprotein (LDL) is to act as a transport vehicle returning peripheral cholesterol to the liver, rather than acting as a delivery mechanism to healthy cells.
  • Equilibrium vs. Deprivation: Aggressive pharmacological downregulation of systemic plasma LDL cholesterol reflects a shifting of systemic lipid equilibrium rather than cellular lipid deprivation.
  • Erythrocyte Mass Dominance: Red blood cell membranes carry a vastly greater absolute mass of structural cholesterol than all circulating systemic plasma lipoproteins combined.
  • Central Storage Reservoir: The human brain is the largest cholesterol reservoir in the body, retaining 20 to 25 grams of cholesterol (approximately 15% to 18% of total body stores) compared to the liver’s 3 to 5 grams.
  • High-Flux vs. Vault Kinetics: The liver operates as a high-flux transaction station that continuously deposits and expels cholesterol mass, whereas the brain acts as a secure vault with a lipid half-life of roughly five years.
  • Atherosclerosis Prerequisite: Atherosclerotic vascular disease cannot mechanically occur without the subendothelial retention and subsequent accumulation of ApoB-containing lipoproteins within the arterial wall.
  • Absolute BBB Exclusion: The blood-brain barrier establishes a strict mechanical barrier that prevents large systemic ApoB-containing lipoproteins from gaining entry to the central nervous system.
  • Fetal Independence: The fetal and developing infant brain synthesizes all required structural cholesterol independently of maternal circulation, even when infant systemic LDL cholesterol tracks as low as 30 mg/dL.
  • Neuronal Metabolic Shifting: At approximately age 10, human neurons completely deactivate autonomous cholesterol synthesis to conserve metabolic ATP for electrical action potentials and synaptic transmission.
  • Astrocyte Manufacturing: Adult brain cholesterol demands are met by astrocytes, which continuously synthesize lipids and secrete them into the matrosome (intercellular space) to feed neighboring neurons.
  • Brain Lipoprotein Substituting: The central nervous system utilizes Apolipoprotein E (ApoE) as its primary structural lipoprotein carrier, substituting for the systemic roles played by ApoB and ApoA1.
  • Buoyancy Homology: Brain-derived lipoproteins are classified as high-density lipoproteins (HDLs) based on density centrifugation, but they carry distinct copies of ApoE rather than systemic ApoA1.
  • Neuronal Clearance Mechanics: Interstitial lipid clearance by neurons is executed primarily by LRP1 (LDL receptor-related protein 1) and scavenger receptor B1 (SR-B1) due to their high binding affinities for ApoE.
  • Divergent Sterol Pathways: The human body splits final sterol synthesis into two distinct operational pathways: the systemic lathosterol pathway and the central desmosterol (Bloch) pathway.
  • Surrogate Plasma Markers: Circulating systemic plasma desmosterol correlates heavily with cerebrospinal fluid desmosterol concentrations, acting as an accessible surrogate marker of brain cholesterol synthesis.
  • Genotypic Isoform Bending: The inherited APOE genotype dictates the physical confirmation of the ApoE protein; single amino acid substitutions alter structural bending and ligand-binding kinetics.
  • ApoE4 Clearance Deficits: The inherited ApoE4 isoform creates a structurally compromised protein that reduces clearance kinetics at the neuronal receptor interface, inducing local cholesterol transport failure.
  • Amyloid Precursor Shifting: Excess cholesterol retention within the neuronal cell membrane physically shifts amyloid precursor protein (APP) into lipid rafts, accelerating toxic beta- and gamma-secretase cleavage.
  • Benign Peptide Production: Physiological concentrations of cell membrane cholesterol keep APP outside of lipid rafts, promoting alpha-secretase cleavage to form non-toxic amyloid-beta 40.
  • Oxysterol Elimination: Neurons clear toxic intracellular cholesterol accumulations by upregulating 24S-hydroxycholesterolase, converting cholesterol into the hydrophilic oxysterol 24S-hydroxycholesterol.
  • BBB Tunneling Dynamics: 24S-hydroxycholesterol alters cell membrane electrostatic charges, forming a microscopic transient path to diffuse across the BBB directly into systemic plasma for hepatic clearance.
  • Distress Biomarkers: Elevated systemic plasma concentrations of 24S-hydroxycholesterol serve as an active clinical biomarker of acute neuronal lipid overload and structural membrane stress.
  • Statin BBB Penetration: Both lipophilic and hydrophilic statins demonstrate steady-state blood-brain barrier penetration, actively inhibiting central HMG-CoA reductase and reducing brain sterol synthesis.
  • Reversible Brain Fog: Excessive statin-mediated suppression of central desmosterol can trigger acute, subjective cognitive deficits, which are rapidly reversed by dose reduction or drug class substitution.
  • Glucuronide BBB Crossing: Ezetimibe is metabolized into ezetimibe glucuronide, which crosses the BBB to block the pathological binding of hexokinase-1 to 14-3-3G proteins, successfully activating protective autophagy.
  • Lysophospholipid Transporters: Systemic omega-3 fatty acids (EPA and DHA) cross the blood-brain barrier via specialized endothelial transport receptors exclusively in the form of lysophospholipids.
  • Index Saturation Targets: Maintaining a red blood cell membrane omega-3 index between 8% and 10% optimizes tissue saturation and ensures adequate membrane fluidity across central and peripheral nervous systems.
  • Obicetrapib Biomarker Attenuation: The potent CETP inhibitor obicetrapib drastically downregulates central neurodegenerative progression biomarkers (p-tau217, NfL, GFAP), with the most profound clinical signals seen in APOE4/E4 homozygotes.
  • ApoA1 Rescue Cascade: Systemic CETP inhibition causes hepatic overproduction of ApoA1, which crosses the BBB to integrate into and structurally rescue dysfunctional ApoE4 brain lipid particles.

IV. Actionable Protocol (Prioritized)

High Confidence Tier (Level A/B Evidence)

  • ApoB and LDL-C Reduction for Cardiovascular Protection: Implement intensive lipid-lowering therapies (statins, ezetimibe, PCSK9 inhibitors) to drive systemic ApoB levels below 60 mg/dL for primary and secondary prevention of atherosclerotic cardiovascular disease (ASCVD). Extensive Level A meta-analyses confirm that lowering systemic ApoB dramatically reduces major adverse cardiovascular events (MACE) without increasing neurodegenerative risk or causing cellular structural deprivation.
  • Targeted CETP Inhibition in High-Risk Genotypes: In patients presenting with high cardiovascular risk and documented APOE4 carrier status (heterozygous or homozygous), recognize the multi-system benefits of potent Cholesteryl Ester Transfer Protein (CETP) inhibition. Data from the pre-specified phase 3 BROADWAY RCT substudy shows that 10 mg daily of obicetrapib over 52 weeks significantly attenuates the progression of Alzheimer’s disease biomarkers. Among APOE4/E4 homozygotes, obicetrapib delivered a placebo-adjusted 20.48% reduction in plasma p-tau217 (P = 0.010), alongside a 6.39% reduction in Glial Fibrillary Acidic Protein (GFAP) and a 10.49% reduction in Neurofilament Light Chain (NfL) Scheltens et al., 2025.

Experimental Tier (Level C/D Evidence)

  • Plasma Desmosterol Surveillance: When deploying aggressive, high-dose systemic statin therapies in patients with an APOE4 genotype or a strong family history of dementia, monitor plasma desmosterol via mass spectrometry as a non-invasive surrogate for central nervous system cholesterol synthesis Sato et al., 2012. Clinicians should titrate therapy to prevent absolute plasma desmosterol levels from dropping below 0.8 mg/L broadly, and maintain levels above 1.0 mg/L in highly vulnerable APOE4 carriers to safeguard against central over-suppression and statin-induced cognitive fog.
  • Optimizing the Omega-3 Index for Structural Fluidity: Supplement with high-dose, purified, third-party verified ethyl ester or phospholipid-bound Eicosapentaenoic Acid (EPA) and Docosahexaenoic Acid (DHA) to achieve and maintain a verified Red Blood Cell (RBC) membrane omega-3 index between 8% and 10%. Observational cohort data establishes a strong correlation between an index greater than 8% and the retention of regional brain volume (specifically hippocampal and white matter tracts) along with improved executive processing speed, although definitive Level A prevention RCTs are lacking Satizabal et al., 2022; Harris & von Schacky, 2004.
  • Ezetimibe Dual-Target Utilization: Utilize ezetimibe (10 mg daily) as a foundational adjunct to low-dose statin therapy. Beyond its established Level A efficacy in blocking intestinal NPC1L1 to lower systemic ApoB, its active metabolite (ezetimibe glucuronide) crosses the blood-brain barrier in trace amounts. Large-scale clinical database mining and structural modeling show that ezetimibe disrupts the pathological 14-3-3G::Hexokinase-1 protein interface, effectively reducing toxic protein aggregation and stimulating defensive autophagy in neurodegenerative models Ganne et al., 2024.

Red Flag Zone (Safety Data Absent / Debunked Claims)

  • Unmonitored Statin Titration Amid Cognitive Decline: Avoid the unmonitored escalation of lipophilic statins (such as simvastatin or atorvastatin) if a patient exhibits acute, subjective cognitive decline or worsening executive dysfunction. While statins are systematically neuro-neutral, excessive local inhibition of the central Bloch pathway can impair synaptic vesicle recycling. Therapy must be adjusted or substituted with non-BBB penetrating options if desmosterol drops below critical thresholds.
  • Commercial Reliance on 24S-Hydroxycholesterol Assays: Do not attempt to order commercial systemic plasma 24S-hydroxycholesterol testing for routine clinical decision-making. Although highly validated in institutional research as an explicit marker of active neuronal lipid overload and membrane stress, standardized commercial assays remain completely absent for outpatient clinical deployment (“Safety Data Absent / Commercial Assay Unavailable”).
  • Off-Label Obicetrapib Sourcing for Isolated Dementia Prevention: Do not prescribe or seek out obicetrapib for the sole indication of preventing cognitive decline or treating asymptomatic Alzheimer’s disease. The drug is currently an investigational molecule moving through formal regulatory channels; its validated clinical endpoints are strictly restricted to peripheral ApoB reduction in patients with heterozygous familial hypercholesterolemia or established ASCVD. Long-term Phase 3 cognitive outcome data must be finalized before clinical adoption for neuro-prevention can be supported.
2 Likes
#7

NMR blood analysis: how mortality risk and more can be assessed from a single blood sample

I. Executive Summary

In this episode of The Drive, host Dr. Peter Attia interviews Dr. James (Jim) Otvos, physical chemist, former professor at North Carolina State University, and creator of the Nuclear Magnetic Resonance (NMR) LipoProfile. The discussion details the biophysical development, clinical evolution, and diagnostic utility of proton NMR spectroscopy in lipidology, metabolic health, and mortality risk stratifying.

Initially developed to debunk a 1986 study claiming NMR plasma spectra could diagnose cancer, Dr. Otvos discovered that distinct methyl proton signals from fatty acid chains within circulating lipoproteins generate size-dependent frequency shifts. Because larger lipoprotein particles emit lower-frequency signals while smaller particles emit higher-frequency signals, automated spectral deconvolution quantifies VLDL, LDL, and HDL particle numbers and subspecies dimensions in under 30 seconds without ultracentrifugation or chemical precipitation.

A primary thesis of the discussion dismantling traditional lipidology dogma is that cardiovascular disease risk is dictated by total apolipoprotein B-containing particle concentration (LDLP or ApoB)—the physical count of lipid containers invading the arterial endothelium—rather than the mass concentration of cholesterol contained within them (LDLC). The common clinical belief that large, “fluffy” LDL particles are benign is false; patients with Familial Hypercholesterolemia (FH) possess predominantly large LDL particles yet suffer severe, accelerated atherosclerosis due to extreme particle numbers. When LDLC and LDLP percentiles diverge (discordance), which occurs frequently in insulin-resistant, obese, or diabetic individuals due to CETP-mediated triglyceride/cholesteryl ester exchange, cardiovascular event risk tracks strictly with LDLP/ApoB.

Beyond lipidology, Dr. Otvos describes advanced multi-marker composite scores derived from the same 150 µL plasma NMR scan:

  1. Lipoprotein Insulin Resistance (LPIR) Score (0–100): Aggregates six subclass dimensions to detect peripheral insulin resistance years before fasting glucose or HbA1c elevate, enabling primordial prevention before pancreatic beta-cell exhaustion.
  2. GlycA: Measures N-acetylglycan methyl protons on circulating acute-phase proteins, serving as a stable, low-volatility biomarker of chronic systemic inflammaging that outperforms volatile high-sensitivity C-reactive protein (hs-CRP).
  3. Metabolic Vulnerability Index (MVX): A composite score combining small HDLP, GlycA, citrate, and three branched-chain amino acids (BCAAs). MVX quantifies systemic catabolic wasting, sarcopenia, and metabolic frailty, powerfully predicting 5-year all-cause and non-cardiovascular mortality in catheterization cohorts (CathGen) and 30-year premature mortality in healthy young adults (CARDIA) independent of chronological age.

II. Insight Bullets

  1. Biophysical Principle of NMR Lipid Profiling: Proton NMR spectroscopy quantifies circulating lipoproteins by measuring chemical shift frequencies and line-broadening of terminal methyl protons on fatty acid lipids, distinguishing VLDL, LDL, and HDL subspecies based on particle diameter (Otvos et al., 1991).
  2. Refutation of 1986 NMR Cancer Claim: The 1986 New England Journal of Medicine study claiming NMR spectra diagnosed malignancy was a false positive driven by high triglycerides and low HDL cholesterol (e.g., in pregnancy or hyperlipidemia) rather than cancer-specific factors.
  3. Atherogenic Primacy of Particle Count (LDLP): The absolute number of circulating ApoB-containing particles (LDLP) dictates arterial wall influx and retention; LDL cholesterol (LDLC) merely measures the variable internal mass payload of those containers (Otvos et al., 2011).
  4. Debunking the “Large Fluffy LDL” Benignity Myth: Large, “fluffy” LDL particles are fully atherogenic when particle counts are high. Patients with Familial Hypercholesterolemia (FH) carry predominantly large LDL particles yet experience severe early coronary artery disease (Nordestgaard et al., 2013).
  5. Mechanism of LDLC vs. LDLP Discordance: Cholesteryl Ester Transfer Protein (CETP) exchanges core triglycerides into LDL in exchange for cholesteryl esters during insulin resistance, yielding cholesterol-depleted, particle-dense LDL pools where LDLP percentiles far exceed LDLC percentiles (Otvos et al., 2011).
  6. Cardiovascular Risk Tracks with LDLP in Discordance: In discordant patient cohorts (e.g., MESA and Framingham), cardiovascular event risk aligns with particle concentration (LDLP / ApoB) rather than cholesterol mass concentration (LDLC) (Otvos et al., 2011).
  7. Inadequacy of LDLC Sizing Adjustments: Pharmacological interventions that increase LDL particle size without reducing total particle count (e.g., niacin, fibrates) fail to lower cardiovascular event rates in randomized controlled trials (Otvos et al., 2011).
  8. Statin-Induced Particle-Payload Mismatch: Statin therapy clears core cholesterol faster than it removes physical ApoB particles, frequently leaving patients with target LDLC levels (<70 mg/dL) but persistent, elevated LDLP and residual vascular risk (Otvos et al., 2011).
  9. Lipoprotein Insulin Resistance (LPIR) Score Utility: The LPIR score (0–100) combines six VLDL, LDL, and HDL particle subclass parameters to identify peripheral insulin resistance up to a decade prior to impaired fasting glucose or HbA1c elevation (Otvos et al., 2014).
  10. Primordial Prevention in Pre-Diabetes: Waiting for fasting glucose to cross 100 mg/dL allows significant pancreatic beta-cell functional decline (~50% loss); tracking LPIR captures causal insulin resistance before beta-cell exhaustion occurs (Otvos et al., 2014).
  11. GlycA as a Stable Inflammaging Biomarker: GlycA measures NMR signals from N-acetylglycan methyl protons located on circulating acute-phase proteins (alpha-1-acid glycoprotein, haptoglobin, alpha-1-antitrypsin), capturing systemic inflammatory tone (Akinkuolie et al., 2014).
  12. Limitations of High-Sensitivity C-Reactive Protein (hs-CRP): Single hs-CRP measurements exhibit high biological volatility (spiking up to 1,000-fold during acute minor infections), whereas GlycA provides a low-variance, integrate baseline measure of chronic low-grade inflammation (Akinkuolie et al., 2014).
  13. Metabolic Vulnerability Index (MVX): MVX (0–100) integrates small HDLP, GlycA, citrate, and three branched-chain amino acids (leucine, isoleucine, valine) to quantify systemic catabolic wasting, sarcopenic risk, and all-cause mortality (Dungan et al., 2023).
  14. Biphasic Risk Profile of Circulating BCAAs: Elevated circulating BCAAs signal peripheral insulin resistance and type 2 diabetes risk, whereas severely depressed BCAAs (paired with low citrate and low small HDLP) signal catabolic protein-energy wasting, cachexia, and acute mortality risk (Dungan et al., 2023).
  15. MVX Sub-Score Decomposition (IVX vs. MMX): MVX decomposes into the Inflammatory Vulnerability Index (IVX = GlycA + small HDLP) and the Metabolic Malnutrition Index (MMX = citrate + BCAAs), enabling clinical differentiation between systemic inflammatory drivers and sarcopenic/wasting drives (Dungan et al., 2023).
  16. Chronological Age-Independence of MVX: Baseline MVX score distributions in 25-to-30-year-old adults (CARDIA cohort) are nearly identical to distributions in 60-year-old cohorts (MESA) and independently predict 30-year premature mortality in disease-free individuals.
  17. Protective Role of Small HDLP: Small, dense HDL particles carry major anti-inflammatory and antioxidant enzymatic payloads (e.g., paraoxonase-1); lower small HDLP counts independently correlate with elevated 2-to-5-year all-cause mortality (Dungan et al., 2023).
  18. Dominance of Non-Cardiovascular Mortality in Cardiac Cohorts: In cardiac catheterization cohorts (CathGen), over 60% of 5-year deaths occur from non-cardiovascular causes (renal failure, oncological cachexia, systemic frailty) accurately captured by MVX rather than traditional lipid panels (Dungan et al., 2023).
  19. Friedewald Equation Flaws in Advanced Lipid Management: Calculating LDL-C by dividing triglycerides by 5 introduces gross estimation errors when triglycerides exceed 150 mg/dL or when LDL-C is reduced below 70 mg/dL, underestimating true particle burden.
  20. Diagnostics Infrastructure Deployment Failures: Automated IVD hardware (Vantera NMR analyzer) clearance by the FDA in 2011 was curtailed when LabCorp acquired LipoScience in 2014, shifting business models from open diagnostic equipment sales to centralized proprietary testing.
  21. Extended Multi-Omic Panel Generation via Machine Learning: Machine learning models applied to a single 30-second NMR spectrum extract a standard lipid panel, ApoB, LPIR, GlycA, and MVX simultaneously from 150 µL of plasma without incremental chemical reagent costs.
  22. CETP Inhibitor Spectral Deconvolution Artifacts: CETP inhibitors (e.g., obicetrapib) generate abnormally hyper-enlarged HDL particles that overlap spectral boundaries of small dense LDL, requiring specialized NMR algorithm adjustments to maintain accurate LDLP reporting.
  23. Digital Biobank Retrospective Re-Mining: Digitally archived raw NMR spectra from historical clinical trial cohorts can be retroactively re-analyzed for novel composite scores (such as LPIR or MVX) decades after blood draw without consuming physical serum samples.

IV. Actionable Protocol (Prioritized)

High Confidence Tier (Backed by Level A/B Evidence)

  • Target Particle Count (ApoB / LDLP) Management: In patients undergoing cardiovascular risk assessment or statin therapy, titrate interventions to achieve target ApoB (<70 mg/dL for moderate risk; <50 mg/dL for high risk) or LDLP percentiles (<20th percentile) rather than relying solely on LDLC (Otvos et al., 2011; Grundy et al., 2019).
  • Primordial Insulin Resistance Screening via LPIR: Utilize the LPIR score (or fasting insulin / TG:HDL ratio) to detect subclinical insulin resistance in patients with normal fasting glucose (<100 mg/dL) and initiate early dietary, exercise, and lifestyle modifications (Otvos et al., 2014).
  • Aggressive ApoB Lowering in Familial Hypercholesterolemia: Treat patients with FH or elevated LDLP aggressively with statins, ezetimibe, or PCSK9 inhibitors regardless of particle size distribution (“large fluffy” LDL), as total particle concentration dictates vascular wall retention (Nordestgaard et al., 2013).

Experimental Tier (Level C/D Evidence with High Safety Margins)

  • Systemic Inflammaging Assessment via GlycA: Evaluate chronic low-grade systemic inflammation using GlycA testing (especially when hs-CRP yields volatile or ambiguous results) to guide anti-inflammatory lifestyle interventions (Akinkuolie et al., 2014).
  • Metabolic Frailty and Mortality Profiling via MVX: Order the Metabolic Vulnerability Index (MVX) in older adults, surgical candidates, or complex chronic disease patients to stratify 5-year mortality risk and identify underlying protein-energy wasting or sarcopenia (Dungan et al., 2023).
  • Targeting Low BCAAs / Catabolic Wasting: In patients exhibiting high MMX sub-scores (depressed BCAAs and citrate), initiate targeted dietary protein supplementation (1.6–2.2 g/kg/day) and progressive resistance training to attenuate sarcopenic muscle loss.

Red Flag Zone (Debunked or Safety Data Absent)

  • Ignoring High LDLP / ApoB Due to “Large Fluffy LDL” Patterns: Debunked strategy. Large LDL particles at high particle concentrations promote atherogenesis and cardiovascular events; assuming large LDL is protective or harmless is clinically false (Nordestgaard et al., 2013).
  • Relying on Niacin or Fibrates to Enlarge Particle Size: Debunked strategy. Pharmacological enlargement of LDL particle size without reducing total ApoB/LDLP count fails to reduce cardiovascular events and may introduce off-target metabolic toxicity (Otvos et al., 2011).
  • Single hs-CRP Measurement for Chronic Risk Assessment: Flawed approach. Single hs-CRP measurements are highly volatile; clinical decisions regarding systemic inflammation should rely on multi-sample hs-CRP averaging or stable aggregate markers like GlycA (Akinkuolie et al., 2014).
1 Like
#8

Environmental pollution and longevity: air pollution, noise, light, EMFs, & more (AMA 87 sneak peek)

I. Executive Summary

In this Ask Me Anything episode of The Drive, host Dr. Peter Attia and co-host Nick examine physical environmental pollution—specifically ambient air pollution, acoustic noise, artificial light at night (ALAN), and electromagnetic fields (EMFs)—and evaluate its clinical relevance to human healthspan and lifespan. Moving beyond ingested chemical toxicants (such as microplastics, PFAS, and phthalates), the discussion establishes a framework to differentiate high-magnitude, acute environmental hazards from chronic, sub-acute exposures encountered in daily life.

The primary thesis asserts that while acute catastrophes (e.g., proximity to industrial disasters or active wildfires) cause obvious physiological harm, the broader longevity concern stems from cumulative “area-under-the-curve” exposure to low-level physical stressors. Over decades, chronic exposures—such as living near major roadways, cooking indoors with inadequate ventilation, or sleeping in noisy, photically dense urban settings—can subtly drive cardiovascular disease, respiratory illness, metabolic dysfunction, cognitive decline, and all-cause mortality.

However, Dr. Attia emphasizes the severe epidemiological and methodological challenges inherent in studying environmental exposures. Because randomized controlled trials (RCTs) exposing humans to environmental toxins are ethically impossible, research relies on observational epidemiology and natural experiments. Unlike high-magnitude causal vectors such as cigarette smoking—which yields hazard ratios (HR) exceeding 10.0 (a >1,000% risk increase for lung cancer)—environmental exposures typically generate weak statistical associations with hazard ratios between 1.1 and 1.3 (a 10% to 30% relative risk increase). At these low thresholds, observational data struggles to eliminate residual confounding, measurement noise, and co-exposure clustering (e.g., highway proximity simultaneously delivers fine particulate matter, nitrogen dioxide, high-decibel noise, and nocturnal light pollution). Furthermore, coarse spatial proxies, such as zip-code-level monitoring, fail to capture individual exposure heterogeneity, commuting habits, or indoor air filtration efficiency.

Consequently, environmental risk mitigation must be structured within a strict hierarchy of health priorities. Physical environmental exposures reside well below fundamental modifiable health behaviors—specifically restorative sleep, progressive physical exercise, nutrient-dense nutrition, blood pressure control, and metabolic health. Investing in high-cost air purifiers or EMF-shielding gadgets while maintaining a sedentary lifestyle, poor diet, or chronic sleep deprivation represents a fundamental inversion of priorities. Longevity optimization requires an “80/20” risk-reduction strategy: perfecting core behavioral habits first, followed by pragmatic, low-burden environmental interventions—such as indoor HEPA filtration and sleep-environment light/noise control—to lower cumulative exposure without inducing unhelpful health anxiety.

II. Insight Bullets

  1. Definition of Physical Environmental Pollution: Clinically defined as the introduction of harmful substances or physical energy vectors (particulate matter, acoustic energy, artificial light, electromagnetic radiation) into the environment that negatively alter human physiology.
  2. Categorical Separation from Chemical Pollutants: Physical environmental exposures (ambient air, noise, light, EMFs) operate through distinct physiological mechanisms compared to ingested chemical toxicants (microplastics, PFAS, phthalates).
  3. Primary Pathophysiological Targets: Chronic physical pollution drives systemic vascular inflammation, endothelial dysfunction, autonomic nervous system dysregulation, sleep architecture disruption, and accelerated cardiovascular decay.
  4. Area-Under-The-Curve (AUC) Exposure Paradigm: Longevity risk is dictated by cumulative, low-level sub-clinical exposure over decades (“area under the curve”) rather than short-term environmental fluctuations.
  5. Ethical Limits of Interventional Human Research: Evaluating environmental pollution is inherently constrained because ethical standards prohibit randomizing human cohorts to toxic environmental conditions.
  6. Observational Hazard Ratio Magnitude Limitations: Environmental epidemiology yields modest hazard ratios (1.1–1.3), making causal inference significantly more complex than high-magnitude vectors like smoking (HR > 10.0).
  7. Residual Confounding in Observational Data: Unmeasured socioeconomic, lifestyle, and dietary variables frequently confound small statistical associations in environmental observational cohorts (Source unverified in live search).
  8. Co-Exposure Matrix Clustering: Traffic-dense environments simultaneously expose populations to fine particulate matter (PM2.5​), nitrogen dioxide (NO2​), high-decibel noise, and artificial light, obscuring single-agent causality.
  9. Inaccuracy of Coarse Spatial Exposure Proxies: Zip-code or regional air monitoring stations fail to account for individual time-in-microenvironments, personal commute variations, or indoor filtration efficiency.
  10. The Priority Inversion Phenomenon: Procuring expensive environmental protection devices (e.g., $2,000 air purifiers) while maintaining sedentary habits, poor nutrition, or chronic sleep deprivation represents a fundamental health misallocation.
  11. Hierarchy of Modifiable Longevity Levers: Behavioral pillars—restorative sleep, progressive exercise, metabolic optimization, and blood pressure control—exert exponentially greater control over lifespan than non-extreme environmental exposures.
  12. The 80/20 Risk Reduction Rule: Achieving 80% of environmental risk mitigation requires a small number of high-yield, low-burden interventions rather than attempting total exposure elimination.
  13. Sub-Acute Indoor Air Quality Drivers: Indoor combustion sources (gas stoves, wood-burning fireplaces) and inadequate home ventilation contribute substantially to daily particulate and nitrogen dioxide exposure.
  14. Acoustic Pollution as a Cardiovascular Stressor: Chronic nocturnal ambient noise (>55 dB) triggers sympathoadrenal activation, elevating nocturnal cortisol, blood pressure, and vascular endothelial damage (Source unverified in live search).
  15. Artificial Light at Night (ALAN) and Melatonin Suppression: Nocturnal exposure to ambient artificial light suppresses pineal melatonin secretion, disrupting circadian clock gene expression and sleep architecture (Source unverified in live search).
  16. Electromagnetic Fields (EMFs) Signal vs. Noise: Low-frequency non-ionizing electromagnetic radiation (cell towers, Wi-Fi, 5G) lacks robust mechanistic or epidemiological evidence of physiological harm at consumer levels (Source unverified in live search).
  17. Polarization in Environmental Risk Perception: Public discourse trends toward extreme unconcern or unscientific health anxiety, driven by invisible exposure vectors and aggressive commercial marketing of shielding devices.
  18. Multi-Factorial Disease Pathogenesis: Environmental exposures act as minor disease modifiers alongside dominant genetic predispositions, metabolic health, and cardiorespiratory fitness.
  19. Impossibility of Total Environmental Isolation: Attempting to eliminate all physical exposures is metaphysically impossible and psychologically counterproductive, driving chronic health anxiety.
  20. Targeted Microenvironment Optimization: Prioritizing pollution control in high-duration microenvironments (the bedroom and primary workspace) yields the highest return on investment for cumulative exposure reduction.

IV. Actionable Protocol (Prioritized)

High Confidence Tier (Backed by Level A/B Evidence)

  • Optimize Baseline Behavioral Pillars First: Ensure primary longevity inputs—7–9 hours of restorative sleep, 150–300 minutes/week of aerobic and resistance exercise, metabolic health management (ApoB, HbA1c), and blood pressure control (<120/80 mmHg)—are fully established before allocating significant capital to environmental mitigation (Arnett et al., 2019).
  • Targeted Indoor HEPA Air Filtration: Deploy high-efficiency particulate air (HEPA) filtration units in primary high-duration microenvironments (specifically the bedroom) to reduce indoor PM2.5​ and ultrafine particulate exposure, particularly in urban or high-traffic zones (Source unverified in live search).
  • Sleep Environment Photic & Acoustic Shielding: Eliminate nocturnal artificial light at night (ALAN) using blackout curtains or eye masks, and minimize ambient noise disruptors (using white noise or earplugs) to preserve nocturnal melatonin secretion and autonomic recovery (Source unverified in live search).

Experimental Tier (Level C/D Evidence with High Safety Margins)

  • Active Kitchen Ventilation Protocols: Utilize external-exhaust range hoods or open windows whenever operating indoor gas combustion appliances (gas stoves/ovens) to attenuate nitrogen dioxide (NO2​) and indoor combustion particulate accumulation.
  • Continuous Indoor Air Quality (IAQ) Monitoring: Monitor indoor PM2.5​, total volatile organic compounds (TVOCs), and CO2​ levels using consumer-grade IAQ sensors to guide opportunistic ventilation.

Red Flag Zone (Debunked or Safety Data Absent)

  • Inversion of Longevity Priorities: Purchasing expensive air or environmental filtration devices while remaining physically sedentary, consuming an ultra-processed diet, or suffering from untreated sleep apnea represents an unscientific allocation of health resources.
  • EMF / 5G Radiation Shielding Devices: Unsubstantiated and commercialized. Consumer products claiming to shield against non-ionizing cell phone or Wi-Fi radiation (EMF pendants, phone stickers, bed canopies) lack clinical or mechanistic evidence of health benefit (“Safety Data Absent”).
  • Extreme Environmental Health Anxiety: Attempting total exposure elimination or living in extreme isolation induces chronic neuroendocrine stress responses that outweigh the minor physical risk of ambient environmental exposures.
1 Like
#9

403 ‒ Peptides: separating scientific promise from marketing hype

I. Executive Summary

In this presentation, Dr. Peter Attia provides a critical evaluation of the wellness peptide ecosystem, dismantling the misconception that “peptide” denotes an inherently safe or therapeutic class of compounds. A peptide is merely a biochemical descriptor—a short chain of amino acids—encompassing both life-saving, FDA-approved drugs like insulin and GLP-1 agonists, and uncharacterized gray-market compounds lacking human safety or efficacy data. The wellness industry frequently leverages naturalistic fallacy to market abandoned or investigational molecules as risk-free cure-alls for tissue repair, cognitive enhancement, and longevity.

Dr. Attia outlines a five-question clinical framework to interrogate any therapeutic claim: (1) Is there a falsifiable mechanism of action? (2) Is there evidence of meaningful human clinical benefit? (3) Are safety, dosing, and human pharmacokinetics characterized? (4) Does the clinical benefit justify the individual risk? (5) Are there superior, better-characterized alternatives? Applying this framework classifies peptides into three distinct tiers: scientifically unsupported (Bucket 1), biologically plausible but clinically unproven or abandoned (Bucket 2), and scientifically legitimate molecules (Bucket 3).

Key case studies highlight these distinctions. BPC-157 exemplifies Bucket 1: despite three decades of preclinical claims, its full sequence origin remains proprietary, over 80% of literature derives from a single conflicted research group, its plasma half-life is under 30 minutes, and zero peer-reviewed human randomized controlled trials (RCTs) exist. Moreover, its alleged pro-angiogenic VEGF pathways present unquantified oncogenic risks. CJC-1295 represents Bucket 2: although it successfully elevates GH and IGF-1, its Phase 2 clinical trial was terminated following a patient fatality, and growth hormone elevation fails to improve functional strength in growth hormone-replete adults.

Ultimately, the gray market serves as a salvage yard for compounds rejected during formal drug development, where ~90% of candidates fail due to toxicity or lack of efficacy. Substituting regulated pharmaceuticals with gray-market peptides sacrifices lot-to-lot consistency, purity, and safety oversight in exchange for anecdotes confounded by placebo, regression to the mean, and concurrent lifestyle changes.

II. Insight Bullets

  1. Chemical Descriptor vs. Quality Stamp: “Peptide” describes a short chain of amino acids, not drug safety, efficacy, or purity. Using the term to imply inherent health benefits represents a marketing tactic rather than a biological reality.
  2. The Naturalistic Fallacy in Peptides: Most commercially marketed wellness peptides are not natural; they are synthetic, modified analogs engineered to alter receptor binding affinity, metabolic half-life, or tissue selectivity.
  3. Falsifiable Mechanism Requirement: Approximately 97% of FDA-approved therapeutics operate via a known, defined target mechanism. Claims lacking a clear receptor or molecular pathway represent marketing language rather than actionable pharmacology.
  4. Preclinical-to-Clinical Failure Rates: Over 90% of drug candidates entering clinical trials fail to reach regulatory approval, with 30% to 50% failing in Phase 1 due to unexpected human toxicity or pharmacokinetic breakdown (Sun et al., 2022).
  5. The Five-Question Interrogation Framework: Evaluating any drug requires assessing mechanism of action, human clinical outcome data, pharmacokinetic/pharmacodynamic (PK/PD) predictability, risk-versus-benefit context, and availability of superior alternatives.
  6. Three-Bucket Evidence Classification: Compounds map into Bucket 1 (scientifically unsupported), Bucket 2 (biologically plausible but clinically unproven/abandoned), or Bucket 3 (scientifically legitimate therapeutics).
  7. Non-Transferability of Evidence: Clinical trial validation belongs strictly to a specific dose, route of administration, indication, patient population, and manufactured product; evidence does not transfer to off-label uses or gray-market versions.
  8. Murky Provenance of BPC-157: BPC-157 is marketed as a gastric protein fragment, but its original discoverer refused to publish its parent protein sequence or screening methodology, creating a fundamental lack of scientific transparency (Pharmaceutics, 2026).
  9. Replication Deficit in BPC-157 Research: Over 80% of published BPC-157 literature originates from a single academic group with commercial IP interests, and zero peer-reviewed human randomized controlled trials exist after 30 years (Emerging Use of BPC-157, 2025).
  10. BPC-157 Pharmacokinetic Disconnect: Preclinical ADME evaluations reveal a rapid plasma half-life of less than 30 minutes, directly contradicting claims of systemic, multi-day tissue regeneration (Pharmaceutics, 2026).
  11. Oncogenic Risks of Pro-Angiogenic Claims: Proponents claim BPC-157 acts via VEGF and nitric oxide upregulation; if biologically active, stimulating these pathways carries unquantified risks of promoting tumor angiogenesis and pathological tissue remodeling.
  12. Scope Creep as a Red Flag: Validated therapeutics narrow their indications through rigorous trials, whereas unsupported compounds expand claims across unrelated disorders (e.g., tendon rupture, gut disease, multiple sclerosis) without human trial data.
  13. CJC-1295 Phase 2 Trial Fatality: CJC-1295 is a synthetic GHRH analog whose Phase 2 clinical trial was permanently halted after an enrolled patient died from a fatal myocardial infarction (AJSM Review, 2025).
  14. Growth Hormone Axis Misconceptions: Raising GH and IGF-1 in growth hormone-replete adults increases total lean mass primarily through fluid retention without demonstrating improvements in functional muscle strength or physical performance (Liu et al., 2007).
  15. Tesamorelin vs. CJC-1295 Commercial Realities: Tesamorelin (a GHRH analog) successfully passed Phase 3 trials and earned FDA approval for HIV-associated lipodystrophy, disproving claims that pharmaceutical companies ignore peptides due to lack of patentability (FDA Approval, 2010).
  16. SS-31 (Elamipretide) Indication Specificity: Elamipretide targets mitochondrial cardiolipin and received approval for severe orphan conditions like Barth Syndrome, where risk-benefit trade-offs differ entirely from healthy individuals seeking energy enhancements (Elamipretide First Approval, 2025).
  17. Gray Market as a Pipeline Salvage Yard: Gray-market peptide vendors primarily commercialize molecules abandoned by pharmaceutical pipelines due to unacceptable side effects, poor bioavailability, or failure to outperform existing standard of care.
  18. Molecule vs. Manufactured Drug Product: Pharmacology is inseparable from chemical engineering; an amino acid sequence in the abstract is not a drug. Manufacturing methods, purity, stability, endotoxin control, and excipient formulation dictate actual physiological activity.
  19. Analytical Limitations of Third-Party Testing: HPLC and mass spectrometry confirm identity and relative concentration in a single sample vial, but cannot verify sterility, absence of bacterial endotoxins, lot-to-lot consistency, or clinical pharmacokinetics.
  20. Confounding Factors in Injury Testimonials: Anecdotal reports of injury recovery are heavily confounded by regression to the mean, natural tissue healing timelines, and concurrent interventions like physical therapy, rest, or anabolic steroids.
  21. Placebo Amplification Factors: Pain and subjective energy are highly sensitive to placebo effects, which are heightened by subcutaneous injection rituals, high monetary expense, authority figures, and biohacking narratives.
  22. The Falsifiability Test: If no negative observation, trial result, or non-response can convince a user that a peptide is ineffective, the claim has ceased to be scientific and has transitioned into an uncorrectable narrative.

IV. Actionable Protocol (Prioritized)

High Confidence Tier (Level A/B Evidence)

Protocols backed by rigorous Phase 3 randomized controlled trials (RCTs), systemic meta-analyses, and formal regulatory approvals.

  • GLP-1 Receptor Agonist Therapy for Metabolic Health:
    • Evidence Level: Level A Phase 3 RCTs (Wilding et al., 2021).
    • Clinical Protocol: Subcutaneous administration of FDA-approved semaglutide or tirzepatide under medical supervision for obesity, type 2 diabetes, and cardiovascular risk reduction. Requires standardized pharmaceutical manufacturing, dose escalation, and metabolic monitoring.
  • Tesamorelin for Visceral Adiposity in Indicated Populations:
    • Evidence Level: Level A Phase 3 RCTs (FDA Approval, 2010).
    • Clinical Protocol: Daily subcutaneous injection of pharmaceutical Tesamorelin for visceral fat reduction in HIV-associated lipodystrophy. Requires monitoring of IGF-1 levels and glucose tolerance.

Experimental Tier (Level C/D Evidence)

Protocols undergoing formal clinical trial development or utilized for specific orphan medical indications under physician oversight.

  • Elamipretide (SS-31) for Target Mitochondrial Dysfunction:
    • Evidence Level: Level C Clinical Trials / Accelerated Approval (Elamipretide First Approval, 2025).
    • Clinical Protocol: Prescribed under specialized supervision for genetically confirmed Barth Syndrome or primary mitochondrial myopathies. Off-label use in healthy individuals for energy or longevity lacks safety and efficacy data.

Red Flag Zone (Safety Data Absent / High Risk)

Unverified, unsafe, or gray-market practices lacking human clinical safety and outcome data.

  • Unregulated Gray-Market BPC-157 Administration:
    • Status: Safety Data Absent / Regulatory Ban.
    • Risk Assessment: Purchasing unapproved BPC-157 from online vendors or compounding pharmacies carries severe risks of bacterial endotoxin contamination, uncharacterized pharmacokinetics, unknown long-term oncogenic potential (via pro-angiogenic pathways), and complete lack of human RCT efficacy data (Pharmaceutics, 2026).
  • CJC-1295 Use for Performance or Growth Hormone Stimulation:
    • Status: Debunked / High Hazard.
    • Risk Assessment: CJC-1295 phase 2 trials were terminated due to a fatal cardiac event. Administering CJC-1295 introduces cardiovascular risks without providing functional muscle strength or performance gains in GH-replete adults (AJSM Review, 2025).
  • Self-Injection of “Research Only” Compounded Peptides:
    • Status: High Hazard.
    • Risk Assessment: Injecting unapproved research chemicals bypasses post-market safety surveillance, sterile manufacturing standards, and clinical toxicity screening, exposing individuals to potential injection-site reactions, immunogenicity, and unpredictable off-target drug interactions.

Produced by Gemini 2.0 Flash

#10

Useful conent but painful to listen to as it felt he was reading out straight from a Claude chat.

#11

I appreciate these AI reviews, especially for podcasts I have not listened to. A relatively minor point, but one worth mentioning, is that AI sometimes confuses key with subordinate points, painting a detailed picture of a single tree but failing to notice the forest. Separately, while Attia may have set the stage for it, I was amused to see it appropriate and repurpose a very specific term from philosophy (‘Naturalistic Fallacy’) to denote the case when one thinks a natural foodstuff is superior solely because it is natural. A sensible appropriation but loose with the language in an area where we want to be precise.

I was especially interested in and informed by the NMR discussion where a tacit inference points in the direction of a unifying master aging clock – a notion I have pointed out to exist only as an empirically weak hypothetic construct to this point.

#12

The NMR model, being a mammal, is the repository of all our hopes and prayers for a longevity solution. Minimal ageing, cancer resilience, high enviromental toxicity tolerance etc. - if only this could be adapted and scaled to humans! Body size to lifespan relationship insane outlier, mouse 3 years, NMR 30+, so like mapped to human would give us a millenium, so instead of centenarians and supercentenarians we’d be talking about millennials (what a different and more worthy context!) and super millennials! Warm blooded social animal from temperate zones, definitely a more appealing model than the greenland shark, lol. Alas, not within our lifetime, geroscience progress at a pace of a mollusk - snail, not suitable to us, mammals.

1 Like
#13

I think you are thinking of a different NMR @CronosTempi. This podcast was focused on what has been learned in the last ~10 years by adapting standard NMR chem lab spectrometers to medical labs for measuring and analyzing both conventional and novel blood markers. These specialized machines ($500K each) combined with software and AI driven analyses of now a few hundred thousand human case records of various parameters are, IMO, opening new frontiers in gero science. Give the podcast a listen. The above summary is useful but you will see much more in the podcast.

2 Likes
#14

What is your diet? when and how are you using C8 MCT oil?

#15

Ha, you are right! :rofl: I pretty much stopped listening to PA as I felt his interests and guest quality had moved away from my interests, so I have not listened to this episode. If the quality has gone up, I might revisit his podcast.

But everything I wrote about the animal - NMR - still stands. It’s a remarkable organism.

1 Like