Concentrate meals into 8–10 hours, preferably without eating dinner very late.
12-month trial (139 people with obesity): eating only between 8:00 am and 4:00 pm with calorie restriction did NOT achieve more weight loss than the same calorie restriction without a schedule. Fasting by schedule is not magic: what counts is calories.
View the study (study) →*⏱ 2 min read
Time-restricted eating is a form of daily fasting in which the time of day during which a person eats is limited or compressed; people who practice time-restricted eating typically eat during a daytime window of 8 to 12 hours and fast for the remaining 12 to 16 hours; unlike intermittent fasting, which involves calorie restriction, time-restricted eating allows a person to eat as much as they want during the eating window.
Time-restricted eating aligns feeding and fasting cycles with the body's 24-hour circadian system, which is critical because the molecular clocks in cells throughout the body anticipate feeding and fasting cycles across day and night; eating outside these circadian rhythms disrupts cell biology and can promote metabolic dysfunction, including insulin resistance, liver fat accumulation, and the systemic inflammation that characterizes many chronic diseases.
In adults with metabolic syndrome, 10-hour time-restricted eating for 12 weeks produced significant reductions in systolic and diastolic blood pressure, total cholesterol, LDL, and body weight; in a study of men with overweight or obesity following 16:8 time-restricted eating for 12 weeks, participants experienced significant reductions in fasting glucose, fasting insulin, and diastolic blood pressure with no change in reported calorie intake, suggesting that the timing of meals, and not only the amount, is crucial for metabolic health.
A TREAT study (randomized controlled trial of time-restricted eating) of 116 adults with obesity found no additional benefits of 16:8 TRE versus calorie restriction in terms of weight loss or cardiometabolic risk factors, but mechanistic and animal studies remain promising, especially for circadian health; and recent data suggest that combining TRE with the right timing, that is, eating earlier in the day aligned with circadian rhythms, may amplify the metabolic benefits beyond those achieved by simply shortening the eating window.
Information, not medical advice. Scientific evidence reflects the quality of the studies.