Snapshot · Huberman Lab
In a randomised study, participants who walked 3–4 times a week for 40 minutes showed a 1% increase in hippocampal volume, versus a stretching control group.
Where this was said
At 53:15 · chapter starts 52:34
The most concrete prescription of the episode lands here: aerobic exercise — specifically, walking — doesn't just slow hippocampal decline, it can reverse it. In the study Castel describes, the walking group grew their hippocampus by 1% over a year while the stretching control group showed continued shrinkage, and their memory performance improved correspondingly. Castel is careful not to oversell the mechanism, but notes that improved oxygenation, better sleep, and elevated mood are likely contributors. He then pivots to what he considers an even more neglected risk: balance. Most people think their balance is fine because they haven't fallen yet — but the one-leg-eyes-closed test in his presentations reliably reveals to audiences of all ages just how fragile their equilibrium is. Falls in older adults cascade into hip fractures, bed rest, muscle loss, reduced exercise, and cognitive decline. The good news is sharp: balance is more trainable than almost any other physical metric, with noticeable gains achievable in one to two months through simple daily practice.
After around age 50, the hippocampus — the brain's key memory centre — shrinks by roughly 1 to 2 percent per year in volume.
One in four people over 65 will fall, often triggering a cascade of physical and cognitive decline. Yet most people think their balance is fine because they haven't fallen yet. Try closing your eyes while balancing on one foot — you'll discover otherwise. The good news: balance can be dramatically improved in one to two months with simple training.
Falls affect one in four people over 65 and can trigger a cascade of physical and cognitive decline, making balance training a critical and underrated priority.
Mental health challenges are nearly universal — BetterHelp's own research found the majority of Americans experiencing symptoms right now.
When applying for Medicaid to cover nursing home costs, there is a 5-year look-back period that can disqualify applicants who gave away or spent down assets.
A broken pipe filled the Bad Friends studio with what the hosts identified as hydrogen sulfide — microscopic fecal aeroparticles — that the crew denied smelling.
Fei-Fei Li's father's liver surgery performed by a da Vinci robot resulted in 10 times less blood loss than a typical open liver surgery, thanks to laparoscopic precision.
Approximately 115 million adults in the US currently have prediabetes, most of whom are unaware, according to the Lingo sponsor segment.
Drug overdose deaths in the US fell from 110,000 to 80,000 in 2024, and then to roughly 70,000 — the largest single-year drop the CDC has ever recorded.
Men's overdose death rate fell 27% in a single year, outpacing the 23% drop for women.
The steepest decline in overdose deaths was among 15–24-year-olds, whose rate fell 37%.
Fei-Fei Li observed that on a given hospital shift, nurses walk miles just to fetch medicine and supplies, illustrating a clear use case for assistive robotics in healthcare.
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