What time we eat may be as important as what we eat. For 37 days, scientists had people avoid exercise as they lived in windowless rooms without clocks, phones or the internet. Among the lessons learned by studying the participants' metabolisms: Humans burn 10% more calories late in the day.

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What time we eat may be as important as what we eat. For 37 days, scientists had people avoid exercise as they lived in windowless rooms without clocks, phones or the internet. Among the lessons learned by studying the participants' metabolisms: Humans burn 10% more calories late in the day.