Ep 65: Supplements, Blood Tests, and Near-Death Experiences (Dr. Peter Attia)

Episode Summary

Executive Summary: Tim Ferriss hosts a follow-up Q&A with Dr. Peter Attia covering longevity-focused testing, supplements, keto, alcohol, glucose metabolism, cardio, hormones, and productivity. Attia emphasizes individualized biomarker-driven decision-making, warns against overgeneralizing diet and supplement advice, and repeatedly frames health choices around what each person is optimizing for rather than one universal protocol.

Main Topics: Longevity-focused blood testing and biomarkers (Priority: 5/5): Attia identifies the most useful tests for long-term risk reduction: ApoE genotype, LDL particle number, LP(a), OGTT with insulin at 0/1/2 hours, and IGF-1. He argues these help assess cardiovascular, metabolic, and cancer risk more meaningfully than generic screening. Supplement stack and periodization (Priority: 5/5): He details his personal supplement regimen—vitamin D, baby aspirin, methylfolate, B12, omega-3s, berberine, and a probiotic—while explaining why he avoids multivitamins and several vitamins. He uses blood levels and symptoms to titrate dosing. Ketogenic diet: benefits, risks, and individual response (Priority: 5/5): Attia says keto can work very well for some people, including himself, but may fail or worsen biomarkers in others. He distinguishes hypocaloric keto from ad libitum keto and notes that long-term population-level evidence is lacking. Glucose tolerance, insulin sensitivity, and carb reintroduction (Priority: 4/5): He explains why some long-term low-carb people appear insulin resistant on testing and why his own results were unusually good. He argues that glycogen depletion and exercise may explain his strong glucose disposal. Alcohol and the toxicity model (Priority: 4/5): Attia rejects the idea that alcohol has proven health benefits and recommends an elimination-reintroduction experiment to determine personal tolerance. He frames alcohol as dose-dependent toxicity with individual variability and non-alcohol components like tannins affecting symptoms. Exercise, cardio, and VO2 max (Priority: 4/5): He argues that extreme endurance exercise may not improve longevity and can stress the heart, while moderate activity is associated with the best outcomes. He also explains that VO2 max is less important than sport-specific performance at VO2 max. Hormone replacement and productivity systems (Priority: 3/5): Attia discusses testosterone therapy as a useful but nuanced tool for symptomatic men, and closes with a description of his highly structured task-management system using color-coded cards and scheduled family time.

Key Arguments: Biomarker testing should be individualized; the most useful tests depend on whether the goal is cardiovascular, metabolic, cancer, or neurodegenerative risk reduction. ApoE status matters because it informs risk for cardiovascular disease and Alzheimer’s and may affect how aggressively one manages cholesterol-related pathways. LDL particle number and LP(a) are central cardiovascular risk markers because particle burden drives atherosclerosis. An OGTT with insulin at 1 hour can reveal hyperinsulinemia before diabetes appears on standard markers like A1C. IGF-1 is important because higher levels are linked to cancer risk, making it a useful target for people with cancer risk or history. Attia’s supplement use is not generic; he supplements only to hit specific blood targets or address known issues like MTHFR-related methylation and low B12. Berberine is useful because it can lower glucose/insulin and may reduce LDL particle number via PCSK9 inhibition. Keto is not universally good or bad; outcomes depend on whether the diet is hypocaloric or ad libitum and on the person’s biomarker response. Some people on keto develop worse CRP, uric acid, homocysteine, adiposity, or LDL particle number, which argues against continuing it. Alcohol should not be assumed beneficial; the best way to know is a month off followed by careful reintroduction. Long-term extreme cardio may not extend lifespan and may increase cardiac electrical stress, whereas moderate exercise appears optimal for longevity. VO2 max is less important than the power or speed you can sustain at VO2 max, especially for performance. Testosterone replacement can be appropriate for symptomatic men with deficiency, but treatment should be guided by a broader hormone panel and patient goals. Productivity improves when tasks are externalized into a structured system that reduces anxiety about forgetting things.

Data Points: Top tests suggested: 5 - Attia’s longevity-oriented shortlist: ApoE genotype, LDL particle number, LP(a), OGTT with insulin, IGF-1. OGTT timing: 0, 1 hour, 2 hours - He recommends measuring glucose and insulin at baseline, one hour, and two hours after a 75-gram glucose drink. Insulin threshold of concern: 40 to 50 - He considers one-hour insulin above roughly 40–50 (lab-dependent) a sign of hyperinsulinemia. Vitamin D dosing: Daily - Part of his personal supplement routine, titrated to target blood levels. Aspirin dose: Baby aspirin daily; 4 baby aspirins on flights - He uses aspirin because his platelet-stickiness test is high and increases the dose during cross-country flights. Keto duration personally: 2.5 years - He says he spent about two and a half years in ketosis before moving away from it. Exercise frequency: Twice a week - He says he lifts weights twice weekly, usually fasted. Insulin suppression test glucose range in cohort: 75 to 400 - He cites a Stanford cohort showing wide variation in steady-state glucose during the test. His OGTT glucose at 1 hour: ~105 - He describes a strong glucose disposal response while in ketosis. His OGTT glucose at 2 hours: 70s - He reports returning to low/normal glucose by two hours. His OGTT insulin at 1 hour: ~15 - He cites a modest insulin rise during the test. His OGTT insulin at 2 hours: ~6 - He reports insulin falling back down by two hours. Cross-country flight frequency: Once or twice a week - He increases aspirin dose on travel days. Cardiac output at rest: 3 to 5 liters/minute - Used to explain how exercise increases cardiac workload. Cardiac output in elite exercise: 30+ liters/minute - He notes trained athletes can reach very high cardiac outputs. EBC enrollment completion: End of summer - He says the Energy Balance Consortium pilot finished enrollment by the end of the summer. EBC follow-up study design target: May or June - He expects the next study design to be completed around then. EBC abstract submission: Next month / November presentation - He says the pilot results will be submitted as an abstract for the Obesity Society meeting in November.

Pivotal Quotes: "What I think is interesting is stuff that a company like Theranos is doing." — Peter Atiyah: Discussing the future of at-home and low-volume blood testing for consumers. "I have never seen convincing evidence that the addition of alcohol confers a health benefit." — Peter Atiyah: Answering whether abstaining from alcohol may be the best biohack. "It depends what you are optimizing for." — Peter Atiyah: Explaining whether carbs after workouts are useful and whether keto should be long-term.

Implications: Listeners should expect personalized, biomarker-led health decisions rather than one-size-fits-all advice. The episode reinforces that diet, supplements, exercise, and hormones should be adjusted to goals, labs, and symptoms, not ideology.