Peter Attia MD359 ‒ How metabolic and immune system dysfunction drive the aging process, NAD, aging clocks, & more
At a glance
WHAT IT’S REALLY ABOUT
Eric Verdin on Metabolism, Immunity, NAD, Rapamycin and Aging Clocks
- Verdin argues that the immune system and central nervous system are rate-limiting organs for aging, and Attia says he should have added immune health as a fifth horseman to his four horsemen of chronic disease.
- On metabolism, Verdin says fuel utilization is central, with ketones the cleanest fuel and glucose the worst, and he points to insulin spikes and glucose-targeting drugs in the Interventions Testing Program as supporting evidence.
- The two debate rapamycin's dose-dependent effects, with Verdin suggesting that mouse models may overstate benefits in humans and that exercise is the one proven anti-aging intervention.
- Verdin explains that CD38 drives the age-related NAD decline, that NMN raised his homocysteine, and that he sees no evidence supporting intravenous NAD, while still urging scientists not to dismiss the sirtuin and NAD field.
- Both speakers consider aging clocks not ready for clinical use, though Verdin is hopeful about his lab's immune-cell-independent clock and about organ-specific proteomic clocks.
IDEAS WORTH REMEMBERING
5 ideasThe immune system and brain may be rate-limiting for aging
Verdin says both are distributed organs, and he cites mouse studies where inducing DNA repair or mitochondrial defects only in the immune system caused senescence across the whole organism.
Antioxidant failure does not disprove the oxidative stress idea
Verdin says reactive oxygen species also serve signaling roles, such as in exercise, and Attia adds that trials may have failed because there are no good biomarkers to confirm the drugs worked.
Vaccine response drops sharply with age
Verdin attributes this partly to thymic involution and cites roughly 30% vaccination success above age 70, though he and Attia could not reconcile this with the apparent benefit of COVID vaccines in older people.
Rapamycin's effect depends on dose and frequency
Verdin says he saw pimples after weekly doses of 4 to 6 mg, a sign of transient immunosuppression, and he stopped taking it because he saw no measurable benefit, unlike with GLP-1 drugs.
Mouse longevity results may not transfer to humans
Verdin notes that Black 6 mice are effectively a single genotype and that lab mice may have high TOR activity, and he suggests the ITP mice live in unhealthy conditions that may exaggerate rapamycin's benefit.
WORDS WORTH SAVING
5 quotesThere are two organs that are rate limiting in terms of your aging, and it's the central nervous system and the immune system.
— Eric Verdin
We have one intervention that is very profoundly anti-aging, and it is physical activity, exercise in all of its forms. And once you have optimized this, I think let's talk about doing something else on top of that.
— Eric Verdin
The beauty of science is that it's incredibly messy on the way up, but eventually, things are getting clarified.
— Eric Verdin
When you're using Black 6, you're essentially doing the experiment on N of one. And the whole world, I mean, like, eighty percent of the work that's being done in mice is done on Black 6. We're all studying the same person.
— Eric Verdin
If you, as a consumer, encounter a company that is selling you a test, especially a test that is not validated in any clinically meaningful way, and then in the same breath selling you a supplement to fix the result of that test, you need to run.
— Peter Attia
High quality AI-generated summary created from speaker-labeled transcript.
