David Dodick at ARDD2025: Cognitive Longevity: Unlocking the future of brain health today
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David Dodick, Mayo Clinic, presents at the 27th Aging Research and Drug Discovery meeting: Cognitive Longevity: Unlocking the future of brain health today
David Dodick argues that cognitive decline is not an inevitable consequence of aging and that current estimates of dementia preventability (45%) are significant underestimates.
A. Executive Summary
Dr. Gregory Day posits that the “longevity boon” will be a failure if cognitive lifespan does not match physical lifespan. He highlights a critical “imagination gap” in medicine, where cognitive decline is treated as an inevitable age-related decline rather than a modifiable pathological process. Currently, 1 in 3 adults over 85 suffer from Alzheimer’s Disease (AD), with women facing a 20% lifetime risk.
The core thesis is that dementia prevention is significantly more achievable than the 45% figure cited by the Lancet Commission. By expanding modifiable factors beyond the Commission’s 14—to include sleep, shingles/flu vaccinations, and hormone replacement therapy (HRT)—Day suggests 47% to 73% of cases are potentially preventable. He emphasizes “precision longevity,” noting that interventions like Metformin or Rapamycin may have divergent effects based on genotype (e.g., APOE4 or TREM2 variants).
Day advocates for a “life course approach,” where brain health is treated as a recursive process starting in childhood. He presents emerging evidence for aggressive risk reduction: hearing aid use can reduce 3-year dementia risk by 48%, and specific vaccinations (shingles/flu) show a dose-response relationship with reduced neurodegeneration. He also highlights the transition from traditional evidence-based medicine to “evidence-informed, risk-adjusted care,” allowing for the use of emerging therapies like GLP-1 agonists, hyperbaric oxygen therapy (HBOT), and mesenchymal stem cells in high-risk patients before full clinical validation is complete.
The presentation concludes by identifying proteomic organ clocks (especially brain and immune clocks) as the future of diagnostics, outperforming chronological age in predicting mortality and disease. He calls for a deeply phenotyped, integrated clinical model that moves from one-on-one medicine to scalable public health interventions.
B. Bullet Summary
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The Cognitive Gap: 89% of executives over 45 rank cognitive decline as their primary health concern regarding aging to 120.
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MCI Prevalence: Approximately 25–33% of the global population over 65 currently meets the criteria for Mild Cognitive Impairment (MCI).
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Preventability Underestimated: While the Lancet cites 45% preventability, including 61 modifiable factors suggests a ceiling of 73% or higher.
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Vascular-Brain Link: 7 of the 14 Lancet risk factors are vascular; Day’s mantra is “Nourish the heart, fortify the brain.”
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Hearing Aids as Neuroprotection: Wearing hearing aids in the context of hearing loss can reduce dementia risk by 48% over three years.
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Blood Pressure Targets: Every 10mmHg drop in BP reduces stroke risk by 37% and dementia risk by 15%.
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Precision Nutrition: Mediterranean diet adherence reduces dementia risk in APOE4 homozygotes by 35%.
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The Vaccine Connection: Recombinant shingles vaccination is associated with a 32% reduction in 6-year dementia risk.
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Flu Shot Efficacy: Receiving 4+ flu vaccine doses over a lifetime correlates with a 57% reduction in dementia risk.
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p-tau217 Blood Tests: The FDA-cleared p-tau217 blood test is >90% predictive of brain amyloid and tau pathology.
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GLP-1s in the Brain: Observational data suggests GLP-1 agonists reduce dementia incidence by 33–53% in diabetics.
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Translational Nuance: Metformin and Rapamycin may have different (potentially negative) effects on cognition depending on APOE or TREM2 status.
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Stem Cell Preservation: Bone marrow-derived mesenchymal stem cells (Longeveron) showed preservation of hippocampal volume in Phase 2 trials.
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Hyperbaric Oxygen (HBOT): Emerging data suggests HBOT improves cerebral perfusion and cognitive performance in MCI.
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Organ Aging Gaps: Proteomic clocks show that “brain age” is the strongest predictor of early mortality.
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HRT & The Brain: Early menopause accelerates organ aging; estrogen therapy is strongly correlated with youthful multiorgan and brain profiles.
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Inflammaging: Cytokine profiles (inflammaging clocks) are more predictive of frailty and cognitive decline than chronological age.
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The Scalability Need: True prevention requires “deep phenotyping”—integrating proteomics, genetics, and continuous longitudinal monitoring.
D. Claims & Evidence Table (Adversarial Peer Review)
| Claim from Video |
Speaker’s Evidence |
Scientific Reality (Best Available Data) |
Evidence Grade |
Verdict |
| Hearing aids reduce dementia risk by 48% |
Cites specific 3-year risk reduction figure |
ACHIEVE Trial (2023) showed this effect only in high-risk older adults. General population effect was null. |
B (RCT - Subgroup) |
Plausible (High Risk) |
| Shingles vaccine reduces dementia risk by 32% |
Recombinant vaccine naturalistic study (200k people) |
Taquet et al. (2024) confirmed Shingrix is associated with 17% more time lived diagnosis-free vs. older vaccines. |
C (Large Cohort) |
Strong Support |
| p-tau217 blood test is >90% predictive |
FDA-cleared test metrics |
ALZ-NET data confirms p-tau217 accuracy rivals PET scans for amyloid/tau. |
B (Diagnostic Validation) |
Strong Support |
| GLP-1s reduce dementia risk by 33-53% |
Observational studies in diabetics |
Meta-analyses of RCTs show promise, but primary outcomes for dementia in non-diabetics (EVOKE trials) are pending. |
C (Cohort) |
Plausible |
| Estrogen/HRT preserves “youthful” brain |
Organ-aging proteomic study (Wisay-Coray) |
The KEEPS trial showed neutral effects on cognition, though “Timing Hypothesis” suggests early initiation is key. |
C (Proteomic/Cohort) |
Plausible (Emerging) |
| Stem cells preserve hippocampal volume |
Longeveron (Lomecel-B) Phase 2 trial |
Phase 2a data showed safety and some volume preservation, but sample sizes are small (). |
B (Small RCT) |
Speculative |
| Metformin/Rapamycin may harm APOE4/TREM2 |
Mechanistic speculation / cohort variance |
Pre-clinical data suggests Rapamycin affects microglia; human evidence for APOE4-specific harm is currently low-grade. |
D (Mechanistic) |
Translational Gap |
E. Actionable Insights
Top Tier (High Confidence - Level A/B Evidence)
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Aggressive BP Management: Target a systolic blood pressure below 130 mmHg (ideally near 120 mmHg) to significantly lower neurovascular risk.
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Audit Hearing Health: If hearing loss is detected, utilize hearing aids immediately. The cognitive load reduction is a proven “low-hanging fruit.”
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Vaccination Protocol: Ensure completion of the 2-dose recombinant Shingles (Shingrix) series and annual Influenza vaccines.
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Know Your Biomarkers: Request high-sensitivity p-tau217 testing if concerned about cognitive symptoms or family history.
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Metabolic Optimization: Target HbA1c < 5.6% and fasting insulin < 7 mIU/L for optimal brain health, rather than just “normal” lab ranges.
Experimental (Risk/Reward - Level C/D Evidence)
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HRT Timing: For women, consider Estrogen replacement therapy at the onset of perimenopause/menopause to mitigate accelerated organ aging.
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Precision Nutrition: If an APOE4 carrier, double down on strict Mediterranean dietary patterns (high polyphenols, Omega-3s).
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GLP-1 Consideration: For those with metabolic syndrome and high genetic AD risk, discuss GLP-1 agonists with a physician for potential off-label neuroprotection.
Avoid
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“Senior Moment” Complacency: Do not treat minor cognitive slips as inevitable. Screen early when the “pathological incubation” period is still active.
H. Technical Deep-Dive: Plasma Proteomics & Organ Clocks
The presentation relies heavily on the Wisay-Coray Organ Aging Model. This technology utilizes large-scale proteomics (SomaScan or Olink platforms) to measure thousands of proteins in plasma. By identifying protein subsets highly expressed in specific organs (e.g., GFAP or NEFL for the brain), researchers can calculate an “organ age.”
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The Brain-Immune Axis: The finding that brain and immune clocks are the best predictors of mortality suggests that systemic aging is governed by central nervous system integrity and inflammatory signaling (Inflammaging).
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Translational Risk: The speaker’s note on TREM2 and Rapamycin refers to the Triggering Receptor Expressed on Myeloid cells 2. In certain genotypes, autophagy enhancers like Rapamycin might inadvertently suppress the microglial response required to clear amyloid-beta, illustrating why “one-size-fits-all” longevity pharmacology is dangerous.
Next Step: Would you like me to perform a specific deep-dive into the upcoming EVOKE trial results (Semaglutide for Alzheimer’s) or retrieve the full paper on Plasma Proteomics Organ Aging?