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Intermittent fasting
Eating within set time windows rather than changing what you eat.
Concepts
Definition
Intermittent fasting is an eating pattern that limits when you eat rather than what — common versions include a daily eating window of eight to ten hours, or a couple of lower-calorie days a week. For weight it mainly works by making it easier to eat less overall; head-to-head studies suggest it is about as effective as ordinary calorie restriction, not magically better. It suits some people and not others, and it is not advised during pregnancy, for people with a history of eating disorders, or without medical advice for those on diabetes medication.
Related terms
Calorie
A unit of food energy; the "calorie" on labels is really a kilocalorie.
Basal metabolic rate (BMR)
The energy your body burns at complete rest just to stay alive.
Added sugar
Sugars put into food and drink, best limited to a small share of energy.
Source: Standard references on time-restricted eating and weight management. · checked 2026-09-04
Frequently asked questions
What is intermittent fasting?
Intermittent fasting is an eating pattern that limits when you eat rather than what — common versions include a daily eating window of eight to ten hours, or a couple of lower-calorie days a week. For weight it mainly works by making it easier to eat less overall; head-to-head studies suggest it is about as effective as ordinary calorie restriction, not magically better. It suits some people and not others, and it is not advised during pregnancy, for people with a history of eating disorders, or without medical advice for those on diabetes medication.
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