Restore Youthfulness & Vitality to the Aging Brain & Body | Dr. Tony Wyss-Coray

This Huberman Lab episode features Dr. Tony Wyss-Coray, a professor of neurology at Stanford School of Medicine and a leading expert in identifying factors that can prevent and reverse organ aging. The discussion centers on the groundbreaking science of organ rejuvenation, particularly the role of factors found in young blood and blood after exercise. Dr. Wyss-Coray's lab has discovered specific proteins that are abundant when we are young but diminish with age, and these can reverse key aging features like cognitive decline and impaired tissue recovery.

The conversation delves into the famous parabiosis experiments, where old mice surgically connected to young mice showed remarkable rejuvenation. Specifically, Dr. Wyss-Coray's team observed that the brains of old mice receiving young blood exhibited reactivated stem cells, reduced inflammation, increased neural activity, and improved memory function. This research challenges the traditional view of bloodborne factors merely as readouts of health, instead demonstrating their potential as active "medicine" that can dramatically alter cellular and organ function, with the composition changing significantly from youth to old age.

The episode explores the translation of these findings to humans, including work by companies like Alkermes and Grifols, which have conducted small clinical trials using blood fractions and therapeutic plasma exchange in patients with Alzheimer's and Parkinson's disease. A notable blinded, placebo-controlled study with 500 Alzheimer's patients showed significant benefits from plasma exchange. They discuss how young blood's rejuvenating effects are multi-faceted, involving both the inhibition of detrimental inflammatory proteins that accumulate with age and the supply of pro-growth factors that stimulate cell activity and maintain stem cells.

Finally, Dr. Wyss-Coray explains that aging is a nonlinear process, with accelerated phases occurring around puberty, the early 40s, and early 60s. He also highlights that different organs age at different rates, and new molecular tools can measure thousands of proteins in a drop of blood to estimate the age of individual organs. While most people's organs age in sync, these tools can identify individuals whose specific organs may be aging faster than the rest of their body.