Snapshot · Huberman Lab
A 2021 study in the Journal of Environmental Science and Technology found significantly higher levels of microplastics in stool samples from people diagnosed with irritable bowel syndrome compared to controls.
Where this was said
At 43:44 · chapter starts 41:29
Nanoplastics lodge in brain, testes, and follicles. A 2021 study found higher microplastics in stool of IBS patients than controls, though causality is unclear.
Elevated urinary phthalate metabolites are associated with lower testosterone in men, women, and children — but the strongest effect is in people aged 40–60. The most likely explanation is that phthalates from plastics build up over decades before their hormonal impact becomes statistically visible.
Despite predictions that AI would eliminate radiologists, the Mayo Clinic's radiology staff grew 55% after AI arrived at reading scans.
In 2025, radiology was the second-highest paid medical specialty in America, with average incomes 48% higher than a decade ago.
A study across 3 hospitals found radiologists spent only 36% of their time reading scans — the part AI can do — with the rest being human judgment.
Robert Greene notes that one in six Americans is on some form of drug to deal with depression, suggesting a deep societal disconnection from meaningful experience.
Spencer Greenberg and Jeremy Stevenson analyzed almost 500 self-improvement techniques and found they all reduce to just 12 underlying psychological drivers.
Cold exposure has good short-term alertness benefits but the evidence base for long-term health benefits is much weaker than popularly believed.
In a randomized study of 20 habit-formation techniques run on hundreds of people, almost none of the techniques produced statistically meaningful results.
People given a tiny-habit fallback option (e.g. 10 squats instead of gym) were actually MORE successful at completing the full habit, not less.
The most effective habit-formation technique was 'habit reflection' — recalling a past successful habit, writing down what helped, then applying those lessons to a new habit.
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