Alarm clocks and late-night snacks have become integral elements of modern routines, but there was a time when human biology relied on the rhythm of daylight and darkness to inform dietary choices.
This internal clock, known as the circadian rhythm, dictates a host of biological processes from sleep to how the body uses food.
Dr James J. Chao, MD, FACS, broke down some of the unique ways bodies handle food differently depending on the time of day.
“Eating in alignment with metabolic rhythms is known to influence nutrient partitioning,” Dr Chao told GB News. “That means when we eat will affect how the body handles what we’re eating.”
Morning meals come with good metabolic perks
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Morning meals come with metabolic perks, as Dr Chao explained that many patients benefit from shifting their meals earlier because insulin sensitivity tends to be higher in the morning hours when most people have greater energy demands throughout the day.
“Eating earlier helps you take advantage of higher insulin sensitivity, increased energy expenditure, and cortisol fluctuations that promote nutrient partitioning, while eating late does the opposite,” he said, noting that late-night eating comes with some real downsides.
Dr Chao pointed out that evening snacking tends to be “sloppier and consumed mindlessly,” with the body becoming less efficient at processing food after dark. This can throw off your hunger hormones and leave you feeling bloated.
Often, nocturnal eating also means reaching for unhealthier snacks and piling on larger portions than you’d normally have during the day.
How to make the switch to eating earlier
Dr Chao advises taking it slow.
“The easiest way to adopt an early eating schedule is to slowly move your window forward,” he explained.
Whether you prefer tucking into breakfast straight away or waiting a couple of hours after waking is entirely your call.
“What’s more important is that you don’t starve yourself during the process,” Dr Chao said. “Start with a 10-hour eating window and adjust your schedule by no more than a few hours every 10-14 days.”
This gradual approach helps your body adapt without triggering binge eating.
‘When we eat affects how the body handles what we’re eating’
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GETTYSome of his patients have managed to narrow their eating windows to just six to eight hours, though this largely depends on how early they begin their first meal.
But staying properly hydrated is crucial, as is getting enough protein at each meal, and keeping active throughout the day.
“The key is to avoid cravings and fatigue,” he said, warning that early time-restricted feeding isn’t a magic fix for everyone.
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