Exactly… Creatine and Taurine next to the Kuerig machine… in my morning coffee everyday.
And on gym evenings… every other day… I make a short coffee with creatine before heading over to the gym… perfect workout energy drink.
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I enjoyed this podcast. The guest is a neuroscientist who (part-time) does work for Formula 1 teams to help optimize the performance of their drivers. Interesting in part because they have very good control over all aspects of the driver’s regimen, from supplements to their entire diet (they all have personal chefs, so easy to know exactly what they are eating). But, not too much new here for you if you’ve been following the science here already…
Neuroscientist Reveals What’s Actually Working for Brain Longevity (with Dr. Tommy Wood)
I. Executive Summary
This transcript analyzes the clinical frameworks of Dr. Tommy Wood regarding cognitive longevity, neuroplasticity, and high-performance biomarker optimization. The core thesis argues that the adult brain is not a structurally static organ doomed to inexorable decline, but a highly plastic tissue that dynamically maps its physical structure to environmental demands. Wood introduces a tripartite “3S Model” (Stimulus, Supply, Support) as the biological scaffolding for neurogenesis and synaptic remodeling.
The primary driver of structural neural adaptation is friction—specifically, dopaminergic error signals (mismatch negativity) and systemic arousal (catecholamine elevation) induced by novel, high-intensity cognitive and physical tasks. Without a precipitating stimulus, exogenous efforts to increase neuroplasticity—such as Transcranial Magnetic Stimulation (TMS) or psilocybin—lack functional utility and risk maladaptive network reinforcement.
Regarding “Supply” and “Support,” the transcript dissects critical translational gaps in biomarker management. Notably, it addresses the synergy required in nutrient supply, highlighting that isolated biomarker optimization often fails. For example, B-vitamin interventions to halt brain atrophy are biologically inert without a concurrent, optimal Omega-3 index. Furthermore, the analysis confronts the significant clinical risk of hyper-lipidemic ketogenic diets. The initial, though highly debated and retracted, data from the Keto CTA trial suggests that metabolically healthy individuals can still experience rapid, heterogeneous atherosclerotic plaque progression when driving extreme elevations in ApoB and LDL, debunking the absolute safety of the “Lean Mass Hyper-Responder” phenotype. The overarching clinical imperative is that cognitive aging and performance optimization demand structured, multi-system physiological management rather than reliance on isolated nutraceuticals or untested pharmaceutical longevity protocols.
II. Insight Bullets
- Neurogenesis is anatomically restricted in adults, but macro-level neuroplasticity—encompassing synaptic pruning, myelination, and astrocytic remodeling—remains active through the eighth decade.
- The Yerkes-Dodson curve dictates neuroplasticity: structural adaptation requires an optimal arousal state, driven by moderate aerobic exertion, brief cold exposure (60-70°F), or hyper-ventilation prior to a learning bout.
- Mismatch negativity (the discrepancy between predicted and actual outcomes) causes a transient pause in dopaminergic firing; this error signal is a mandatory trigger for neural network updating.
- Age-specific incidence of dementia has been steadily declining since WWII, primarily driven by improved population-level cardiovascular disease management and early-life nutritional density.
- Ketogenic diet-induced hyperlipidemia (elevated ApoB/LDL) carries a documented risk of driving soft plaque progression even in metabolically healthy phenotypes, necessitating aggressive coronary CTA surveillance.
- Supra-physiological zinc supplementation—frequently deployed for immune support—competitively inhibits enteral copper absorption, causing clinical hypocupremia and secondary neutropenia.
- Chronically elevated serum Vitamin B6 is endemic in high-performance athletes due to sports supplement overconsumption, increasing the risk for peripheral neuropathy.
- Processing speed cognitive training (e.g., double-decision tasks) increases cholinergic signaling in the forebrain, yielding statistically significant dementia risk reduction up to 20 years post-intervention.
- Homocysteine-lowering protocols via B-vitamin complex supplementation fail to prevent brain atrophy unless the patient’s concurrent Omega-3 index is >6-8%.
- High-Intensity Interval Training (HIIT) generates systemic lactate that crosses the blood-brain barrier to upregulate localized production of Brain-Derived Neurotrophic Factor (BDNF) in the hippocampus.
- Resistance training specifically preserves white matter volume and executive function, mediated via mechanical overload triggering systemic IGF-1 release.
- Resting Heart Rate Variability (HRV) is an inferior predictor of next-day athletic performance; it reflects the systemic physiological cost of prior exertion rather than immediate functional readiness.
- Indoor PM2.5 air pollution drives neuroinflammation and endothelial dysfunction; sustained use of HEPA filtration yields measurable, non-pharmacological reductions in systemic blood pressure.
- Unimodal steady-state aerobic exercise provides inferior cognitive adaptations compared to coordinative exercise (e.g., racket sports), which force simultaneous metabolic output and spatial-temporal processing.
- Routine hemoglobin screening is necessary to detect occult Obstructive Sleep Apnea (OSA), which frequently presents as secondary polycythemia (high hemoglobin) in athletes and aging males.
- Exogenous ketone administration (MCTs or acetoacetate) can bypass impaired cerebral glucose hypometabolism in Mild Cognitive Impairment (MCI), but efficacy in cognitively normal individuals remains unverified.
- Menopausal hormone therapy effectively mitigates vasomotor symptoms—which independently degrade cognition via sleep fragmentation—but evidence for direct, long-term dementia risk reduction in asymptomatic women is conflicting.
- Glymphatic clearance of amyloid-beta and localized adenosine degradation are strictly dependent on uninterrupted sleep architecture; sleep fragmentation mechanically halts this cerebral washout.
- TMS (Transcranial Magnetic Stimulation) functions as a “sledgehammer” that indiscriminately opens neuroplastic windows; without immediate targeted skill application, the induced plasticity is squandered.
III. Adversarial Claims & Evidence Table
| Claim from Video | Speaker’s Evidence | Scientific Reality (Current Data) | Evidence Grade | Verdict |
|---|---|---|---|---|
| High zinc supplementation lowers copper and neutrophils. | Clinical biomarker monitoring in F1 athletes. | High enteric zinc upregulates intestinal metallothionein, which preferentially binds and traps dietary copper, leading to sloughing and systemic deficiency. Wessels et al., 2021 | Level A | Strong Support |
| B-vitamins only prevent brain atrophy if Omega-3 status is optimal. | VITACOG trial (Oxford). | Subgroup analyses of RCTs confirm homocysteine-lowering therapy only slows cerebral atrophy and cognitive decline when baseline plasma omega-3 fatty acid concentrations are high. Oulhaj et al., 2016 | Level B | Strong Support |
| HIIT (Norwegian 4x4) increases hippocampal volume via lactate. | 6-month randomized exercise trial. | HIIT significantly increases serum lactate, which crosses the BBB via monocarboxylate transporters to stimulate local hippocampal BDNF expression. Muller et al., 2020 | Level B | Plausible |
| PDE5 inhibitors (Viagra) lower dementia risk. | UK/US observational database studies. | Large cohort studies show associations between sildenafil use and lower Alzheimer’s risk, but are heavily confounded by the “healthy user effect” (active sex life, better baseline vascular health). Adesoyan et al., 2024 | Level C | Speculative |
| Processing speed brain training reduces dementia risk. | ACTIVE study (20-year follow-up). | The ACTIVE RCT demonstrated that speed-of-processing training, but not memory or reasoning training, resulted in a significant 29% reduction in dementia risk after 10+ years. Edwards et al., 2017 | Level B | Strong Support |
| Ketogenic diet causes rapid plaque progression in healthy individuals. | Retracted/Preliminary Keto CTA trial. | Mechanistically, sustained extreme ApoB elevation (>200 mg/dL) drives LDL particle intimal penetration, risking atherogenesis irrespective of insulin sensitivity. Final CTA human data is still pending publication. Source unverified in live search (Data embargoed/retracted). | Level C | Safety Warning |
| Cocoa flavanols improve cognition in poor diets. | COSMOS-Web trial. | Dietary flavanol replenishment in older adults with low baseline diet quality significantly improves dentate gyrus-mediated memory. Brickman et al., 2023 | Level B | Strong Support |
| Indoor air filters reduce blood pressure. | JAMA environmental intervention study. | RCTs confirm that reducing indoor PM2.5 via portable HEPA purifiers significantly lowers systolic blood pressure and systemic inflammatory markers. Brook et al., 2020 | Level B | Strong Support |
IV. Actionable Protocol (Prioritized)
High Confidence Tier
- Synergistic Neuro-Nutrient Titration: Do not supplement B-vitamins for homocysteine reduction in isolation. Target a combined plasma Omega-3 Index of >8% (via EPA/DHA) and a serum Homocysteine level of <11 µmol/L to functionally halt accelerated brain atrophy.
- Processing Speed Preservation: Deploy targeted cognitive speed-of-processing tasks (e.g., visual double-decision training) rather than passive puzzles (crosswords). This specifically maintains cholinergic forebrain signaling pathways that rapidly decay post-age 60.
- Vascular Defense via HEPA: Install PM2.5-rated air filtration in primary sleeping and working zones. Airborne particulate matter drives endothelial dysfunction, blunting the neurovascular coupling required for localized cerebral blood flow during cognitive exertion.
Experimental Tier
- Arousal-Primed Skill Acquisition: Spike systemic catecholamines prior to deep cognitive work to widen the neuroplastic window. Utilize 20-30 minutes of moderate zone 2 cardio, or brief cold-water exposure (60-70°F), immediately preceding the learning bout.
- Coordinative Aerobic Loading: Transition 30% of weekly unimodal cardio (jogging/cycling) to coordinative sports (e.g., squash, martial arts). The simultaneous metabolic and spatial-temporal processing demands yield superior structural hippocampal adaptations compared to rote exertion.
Red Flag Zone
- Hyper-Lipidemic Ketogenic Diets: Safety Data Absent. The presumption that high ApoB and LDL are biologically benign in the presence of high insulin sensitivity (the “Lean Mass Hyper-Responder” hypothesis) is a severe translational gap. Proceeding with unmanaged ApoB >150 mg/dL requires immediate baseline and annual Coronary CTA tracking.
- Uncycled Zinc Supplementation: Continuous, high-dose zinc prophylaxis for respiratory immunity will induce severe hypocupremia and neutropenia. Limit high-dose zinc acetate strictly to the 48-hour prodromal phase of upper respiratory tract infections.
- Undirected Neuroplastic Agonists: Initiating TMS, psilocybin, or intensive breathwork protocols without immediate, rigorous integration (structured skill learning or clinical therapy) wastes the neuroplastic window and risks cementing maladaptive ruminative networks.
V. Technical Mechanism Breakdown
- Neurovascular Coupling & Endothelial Health: Cognitive exertion demands localized metabolic substrates. Active neural networks trigger adjacent astrocytes to release vasoactive signaling molecules (e.g., arachidonic acid metabolites), causing focal capillary dilation. Systemic atherosclerosis or endothelial dysfunction (driven by PM2.5 exposure or ApoB accumulation) physically blunts this vasoreactivity, starving the activated cortical regions of oxygen and glucose and accelerating neuronal apoptosis.
- The Lactate-BDNF Axis: During HIIT, anaerobic glycolysis produces systemic lactate. Circulating lactate crosses the blood-brain barrier via Monocarboxylate Transporters (MCTs). Within the CNS, lactate acts not only as an energy substrate for neurons but as a signaling molecule that modulates NMDA receptor activity and upregulates the expression of the BDNF gene, stimulating structural growth in the dentate gyrus of the hippocampus.
- IGF-1 & White Matter Myelination: Resistance training subjects skeletal muscle to mechanical overload, stimulating local mechanotransduction pathways and hepatic secretion of Insulin-like Growth Factor 1 (IGF-1). Systemic IGF-1 penetrates the central nervous system, where it acts as an obligate trophic factor for oligodendrocyte survival. Oligodendrocytes are responsible for synthesizing myelin sheaths; thus, IGF-1 preserves white matter tract integrity and action potential propagation velocity (executive function).
- Competitive Enteral Mineral Inhibition: Zinc and copper utilize identical transcellular transport mechanisms in the intestinal lumen. High exogenous zinc boluses artificially upregulate the expression of metallothionein, an intracellular binding protein within enterocytes. Metallothionein has a higher binding affinity for copper than for zinc. It traps dietary copper within the enterocyte, which is eventually sloughed off and excreted in feces, inducing systemic hypocupremia and a subsequent failure in neutrophil maturation in the bone marrow.
- Mismatch Negativity (MMN) & Synaptic Pruning: Adult neuroplasticity is heavily gated by dopaminergic tone. When an individual attempts a novel task and fails, the disparity between the predicted outcome and the actual result triggers “mismatch negativity.” This manifests as a transient suppression of phasic dopamine release in the striatum and prefrontal cortex. This error signal chemically tags the active synapses for pruning or long-term potentiation (LTP), physically rewiring the network to increase future predictive accuracy.
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Note, Dr. Tommy Wood also has his own podcast…
Hosted by Drs. Tommy Wood and Josh Turknett, the Better Brain Fitness podcast explores the frontiers of how to keep our brain healthy and fit, so that we can perform at our best and do the things we love for as long as possible.
https://www.brainjo.academy/the-better-brain-fitness-podcast/
and his new book: Amazon.com: The Stimulated Mind: Future-Proof Your Brain from Dementia and Stay Sharp at Any Age: 9780593797815: Wood, Dr. Tommy: Books
And if you want to go deeper into neuroscience podcasts… I found this:
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I had AI speculate and compare 6 mg Rapamycin + grapfruit Juice vs 6 mg rapamycin plus 1000 mg berberine daily. This is what I got.
Grapefruit Juice + 6 mg Rapamycin
This is well-studied in transplant literature:
- Mechanism: Irreversible destruction of intestinal CYP3A4 + P-gp inhibition
- AUC increase: ~3.5× baseline (some studies: 2.9–4.3×)
- Cmax increase: ~2.5–3.5×
- Tmax: Slightly earlier (faster absorption due to less gut-wall metabolism)
- Effective dose equivalent: 6 mg + grapefruit ≈ roughly ~18–21 mg rapamycin alone
- Duration of effect: Persists 24–72 hrs after the juice (enzyme destroyed)
- Predictability: Relatively consistent effect — furanocoumarin content of juice varies somewhat, but the irreversible mechanism makes it fairly reproducible
One famous small study in transplant patients used deliberate grapefruit co-administration to stretch rapamycin doses and save costs — the effect was that reliable.
Berberine 1000 mg/day + 6 mg Rapamycin
This is less directly studied in humans for sirolimus specifically, but can be estimated from its known PK profile:
- Mechanism: Reversible CYP3A4 inhibition + P-gp inhibition + possible CYP2C19 effects
- AUC increase: Estimated ~1.5–2.5× (moderate inhibitor classification)
- Cmax increase: ~1.4–2×
- Tmax: Modest shift, possibly slightly earlier
- Effective dose equivalent: 6 mg + berberine ≈ roughly ~9–15 mg rapamycin alone
- Duration of effect: Dissipates as berberine clears (~3–5 hrs half-life), but at steady-state 1000 mg/day, inhibition is maintained chronically
- Predictability: More variable — depends on berberine absorption (itself poorly bioavailable, ~5%), gut microbiome conversion, and individual CYP3A4 expression
Side-by-Side Comparison
| Parameter | Rapamycin Alone | + Grapefruit Juice | + Berberine 1000 mg/day |
|---|---|---|---|
| Bioavailability | ~15% | ~45–60% | ~25–35% (est.) |
| AUC fold-increase | 1× | ~3–4× | ~1.5–2.5× |
| Cmax fold-increase | 1× | ~2.5–3.5× | ~1.5–2× |
| Tmax | 1–3 hr | Slightly earlier | Modest change |
| Effect duration | — | 24–72 hrs post-juice | Continuous at steady state |
| P-gp inhibition | — | Yes | Yes |
| Reversibility | — | No (enzyme destroyed) | Yes |
| Human PK data quality | High | High | Low–moderate (indirect) |
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