Does Eating Only Within a Limited Time Window Promote Weight Loss?

Scattered evidence suggests that intermittent fasting (periods of eating separated by 12- to 48-hour periods of abstention) can be effective as a weight-loss method. In a randomized trial, researchers assessed the effects of time-restricted eating compared with regular daily meals on weight loss and metabolic risk markers in 116 adults (mean age, 47; 60% men) who were overweight or obese.

Participants assigned to consistent meal timing were told to eat three meals daily (plus snacks as desired). Those assigned to time-restricted eating were told to eat freely between 12 noon and 8 p.m. and then to fast for the next 16 hours. No recommendations were made regarding calorie and nutrient intake or physical activity. Fifty participants underwent …