Journal Club with Dr. Peter Attia | Metformin for Longevity & The Power of Belief Effects

In their first joint Journal Club, Andrew Huberman and Dr. Peter Attia walk listeners through how scientists critically read research papers. Attia presents a large Danish-registry study (Keyes et al.) that reassesses the famous 2014 Bannister metformin paper, concluding metformin offers no longevity advantage that erases the harms of type 2 diabetes. Huberman then covers a bioRxiv preprint showing that simply believing you took a low, medium, or high dose of nicotine produces a dose-dependent change in real brain activation, not just subjective feelings. Along the way they explain insulin resistance, epidemiology methods, Kaplan-Meier curves, hazard ratios, statistical power, fMRI, and belief versus placebo effects.

• Attia notes the 2014 Bannister paper claimed metformin gave diabetics a 15% reduction in all-cause mortality versus non-diabetics, the result that drove the metformin-longevity craze.
  00:34:50
• The newer Keyes study finds metformin did NOT undo the disadvantage of diabetes, undercutting the longevity hype.
  01:07:36
• Attia stopped taking metformin five years ago after noticing it elevated his resting lactate and likely blunts hypertrophy and strength.
  00:26:31
• Metformin has repeatedly FAILED in the rigorous Interventions Testing Program (ITP), while rapamycin, acarbose, canagliflozin and 17-alpha estradiol succeeded.
  01:14:22
• The nicotine study's twist: all subjects got the same low dose, yet brain activation scaled with what they were TOLD they received.
  01:57:29
• Belief about nicotine dose changed actual thalamus-to-prefrontal-cortex brain activation, not merely subjective experience.
  02:00:03
• Attia surprises Huberman by switching his planned paper at the last minute, choosing a simpler epidemiology paper for broader appeal.
  00:08:20

• You and I sitting with normal blood sugar have only about five grams of glucose in our total circulation.
  00:16:08
• The difference between metabolic health and profound type 2 diabetes is roughly one teaspoon of glucose in your bloodstream.
  00:17:12
• Sleeping only four hours a night for a week can cut your glucose disposal by about half, inducing profound insulin resistance.
  00:24:57
• The Bannister study used 'informative censoring,' dropping metformin patients who progressed, which inflated the drug's apparent benefit.
  00:31:11
• In the ITP, rapamycin extended lifespan ~15% even when given to 60-month-old mice, late in life.
  01:13:50
• Hotel workers told their work counts as exercise lost 12% more weight than a control group, with no difference in actual movement.
  01:44:30
• Nicotine increases signal-to-noise of sensory information via nicotinic receptors in the thalamus, sharpening perception.
  01:46:06
• Medical students develop a warped sense of disease prevalence, fixating on rare 'zebras' like sarcoidosis and situs inversus.
  02:17:05
• Men hugging a thermos to their body in restaurants worldwide are likely Uruguayans drinking yerba mate after meals.
  00:10:24
• Attia frames the brain as a prediction machine where your beliefs about a drug are themselves an important input.
  02:14:31

Books, products and media the guest or host genuinely endorsed here — with the buy link.

Affiliate link — we may earn a commission at no extra cost to you.