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The timestamped data revealed eating often extends into the night, and that most people’s nightly fasts last less than 12 hours.

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For thousands of years, he says, our nightly fast probably started much earlier than in these times of late-night TV and other electrified diversions (Zoom sessions, anyone?) that give us reason to stay up late and eat into the wee hours.Ī 2015 report coauthored by Satchin Panda asked participants to digitally track everything they ate.

What’s more, these days people are eating at times of the day when historically they would have been asleep, says Satchin Panda, a circadian biologist at the Salk Institute in La Jolla, California, who wrote an overview on the timing of eating in the 2019 Annual Review of Nutrition. “We are hard-wired,” D’Agostino says, “to undergo periodic intermittent fasting.” Instead, people evolved to deal with regular fasts: Until the dawn of agriculture around 12,000 years ago, we subsisted on hunting and gathering and often had to perform those activities with empty bellies. We didn’t evolve to eat many small meals day and night, says Dominic D’Agostino, a neuroscientist at the University of South Florida who studies the effects of nutrition on the brain. What also matters is timing: We eat when we shouldn’t, and don’t give our bodies a long enough break in between. Overweight is 25-29.9.)īut an increasing number of researchers think there is more to the rising rates of obesity than endless grazing. (Obesity is defined as a body mass index of 30 or greater severe obesity as 40 or more. In the past 50 years, obesity has become much more common in the United States, with the latest estimates classifying 42 percent of adult Americans as obese.