Diving into Sleep
- 6 days ago
- 2 min read
Short version: Losing just 80 minutes of sleep a night for six weeks caused people to gain weight — but not for the reason scientists assumed. The weight didn't come from eating more. It came from moving less. (original research article as always at the bottom of my summary)
Columbia University just published this in Annals of Internal Medicine. They took 95 adults who normally sleep 7-8 hours and cut their sleep by about 80 minutes a night for six weeks. That's the sleep pattern of roughly 30% of adults — people getting 5 or 6 hours instead of 8. Not extreme. Just normal American sleep deprivation.
Here's the part that lit up my engineering brain. Every previous study on sleep and weight used severe restriction — like 4 hours a night — and found people ate more. Appetite hormones spiked, people overate, weight went up. That's the assumed mechanism: less sleep, more hunger, more eating.
This study found something different. The appetite hormones didn't change significantly. People didn't eat more. They just moved less. Sedentary time jumped by 17 minutes a day on average, and nearly 30 minutes for men and postmenopausal women. Even after accounting for the extra hours awake, they were more inactive. The weight gain — about a pound in six weeks — came from sitting, not snacking.
That pound sounds small. But extrapolate it: roughly 8-9 pounds a year from losing less than an hour and a half of sleep. Yikes.
It's the same pattern we see with our patients. The weight isn't always about what you eat. Sometimes it's about what your body does when it's running on empty. Sleep-deprived people don't just eat worse — they move less, they recover slower, and their bodies quietly shift into a lower gear. After 1,300-plus patients, I can tell you: the ones who sleep poorly plateau more often, and they break through faster when their sleep improves.
If you're on a GLP-1 and hitting a stall, check your sleep before you change anything else. The medication is only half of it. The other half is the system around it — and sleep is part of that system.
-Daryl
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