Ask
Nutrition FAQ
10 questions chosen because they are the ones where the popular answer and the evidence most often come apart. Each opens with the verdict in one sentence — the answer is on the page before you click anything.
Where the honest answer is “it depends” or “we don’t know”, it says so rather than manufacturing confidence. Three of these do.
Controlled trials that limit eating to an earlier window, without changing total calories, generally find weight outcomes similar to eating the same amount later in the day. A twelve-month randomised trial comparing calorie restriction with and without a restricted eating window found that both groups lost weight, and the window added no detectable advantage.
The reason late eating tracks with weight gain in observational data is more ordinary: the food eaten late at night tends to be snack food, eaten past the point of hunger, in front of a screen, and added on top of the day rather than built into it. That is a quantity effect dressed up as a timing effect.
There is a genuine body of research on the body clock suggesting that some metabolic markers do respond to when you eat, and it is worth taking seriously. But the effect is smaller than the popular claim implies, and it is about those markers more than about body weight.
This section is educational reference material for general audiences. It is not medical or dietetic advice, it is not tailored to anyone’s circumstances, medical conditions, allergies or medication, and it is not a substitute for a qualified professional. Figures reported here describe what the cited research measured in the populations it studied — individual requirements vary substantially. Nothing here relates to the use of any product sold on this site.