When adults with excess weight cut calories, whether they eat all their meals in the morning or in the evening, they lose about the same amount of total body weight after three months.
Evidence from Studies
No evidence studies found yet.
What Would Prove This
Per GRADE and EBM methodology, here is what ideal scientific evidence would look like to definitively prove or disprove this claim, ordered from strongest to weakest.
A meta-analysis would determine whether the equivalence in weight loss between early and late TRE holds across diverse populations, durations, and energy restriction levels.
A systematic review and meta-analysis of all published RCTs comparing early TRE (≤8h window ending before noon) vs. late TRE (≤8h window ending after 6 PM) vs. ER alone in adults with overweight or obesity, measuring total body weight change at 8–16 weeks, with standardized energy restriction and adherence monitoring.
An RCT could confirm that total weight loss is equivalent across eating windows when calories are matched, controlling for adherence and activity.
A double-blind, parallel-group RCT of 300 adults with overweight or obesity (BMI 25–35), randomized to early TRE (7 AM–3 PM), late TRE (12 PM–8 PM), or ER alone, all with identical energy restriction based on RMR, using wearable sensors to confirm eating windows and daily activity, measuring total body weight via DXA at baseline and 12 weeks with intention-to-treat analysis.
Could determine whether habitual early or late TRE predicts long-term weight maintenance after initial loss.
A 2-year prospective cohort of 1,500 adults who lost ≥5% body weight via energy restriction, tracking whether they adopted early or late TRE patterns and measuring weight regain over time, adjusting for physical activity, sleep, and dietary quality.
Could identify whether individuals who maintain weight loss are more likely to use early or late TRE.
A case-control study comparing 100 adults who maintained ≥5% weight loss for 1 year after an initial 3-month energy restriction to 100 who regained weight, retrospectively assessing whether they adopted early or late TRE patterns during maintenance.
Could reveal whether current eating window timing is associated with current body weight in a population sample.
A cross-sectional survey of 3,000 adults measuring current eating window timing (via 7-day food diary) and current body weight, adjusting for age, sex, physical activity, and total daily energy intake.