9. Take a nap
In Japan, many people take a daily 20- to 30-minute nap, says James Maas, a sleep researcher at Cornell University and the author of Power Sleep. There is increasing evidence that chronic sleep deprivationraises the risk of weight gain. Maas cites two hormones: leptin, which helps the brain sense when you’re full, and ghrelin, which triggers hunger. The less sleep you get, the lower your leptin levels—and the higher your ghrelin. "Many people think they’re hungry when they’re actually sleepy," Maas says. "Instead of a snack, they need shut-eye."
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