Podbit · Huberman Lab
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.
Where this was said
At 55:30 · 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.
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.
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.
AI nailed Andrew Huberman's vertigo-vs-low-blood-pressure diagnosis because that pattern has been reported millions of times. But every patient's liver is different and data on liver surgeries is scarce worldwide — making solo robot surgery dangerous. The rule is simple: data abundance means AI can help; data scarcity means keep the human in the loop.
Fei-Fei Li's father had liver surgery performed by a da Vinci robot guided by a surgeon. The result: 10 times less blood loss than a typical procedure. This isn't replacement — it's the gold standard of human-machine collaboration, where the human's judgment and the robot's precision combine.
US drug overdose deaths fell from 110,000 to roughly 70,000 — the biggest CDC-recorded single-year drop ever. Men's rates fell 27% in one year, and the steepest decline of all was among 15–24-year-olds, down 37%. The crisis narrative around young men needs to make room for signs of genuine progress.
Kessler thought his grief expertise would protect him. It didn't. When his son David died unexpectedly, he found himself on the floor — and eventually realized that acceptance alone wasn't enough. That unmet need became the sixth stage: finding meaning.
Grief isn't just death — it's any unwanted change. Kessler lectured at Coca-Cola and General Mills not because they had lots of funerals, but because change management is grief management. People who grieve well live well.
Witnessing someone's grief isn't just emotional support — it's an essential act of healing. Kessler argues grief is a severance and connection heals it. But real witnessing has two steps: seeing the pain AND affirming the person's capacity to recover.
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Most people try to control their environment to avoid triggers. Kessler flips this entirely: triggers aren't problems to manage around — they're a detailed map to your pain and your healing. Every trigger points directly to what needs attention.
Running from pain doesn't leave it behind — it accelerates the chase. Whatever we run from pursues us, and whatever we face transforms us. Both Kessler and Lewis Howes testify to knowing both roads firsthand.
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