Relative Effects of Time-Restricted Eating, Energy-Restricted Eating, and Unrestricted Eating on Eating Patterns and Dietary Intake: Results From a Randomized Controlled Trial.

In 30 seconds

This secondary analysis of a randomized controlled trial examined eating patterns and dietary intake among adults with obesity assigned to time-restricted eating (TRE), energy-restricted eating (ER), or unrestricted eating (UE). Of 88 randomized participants, 73 completed baseline and follow-up dietary measures. After 12 weeks, the TRE group reported 1.1 fewer meals per day than at baseline (95% CI, -1.6, -0.7), alongside reductions in energy and several dietary components. Changes in intake did not differ significantly between TRE and ER, while some reductions were more marked with TRE than UE.

Key findings

• TRE participants reported 1.1 fewer meals/day at follow-up than baseline (95% CI, -1.6, -0.7); ER and UE groups showed no change in eating occasions.
• Breakfast reporting declined in the TRE group (OR, 0.13; 95% CI, 0.05, 0.33), with no statistically significant change in ER or UE.
• In TRE, energy intake decreased by -469 kcal/day (95% CI, -681, -257), with reductions also reported in saturated fat, potassium, and total and refined grains.
• Dietary intake changes did not differ significantly between TRE and ER; several reductions were more marked with TRE than UE.

Why it matters

Eating schedules can alter not only meal frequency but also reported nutrient and food-group intake. These findings suggest that an 8-hour TRE approach may produce dietary changes resembling those seen with energy restriction, while also reducing intake of some nutrients and food groups. Monitoring overall dietary adequacy may therefore be relevant when evaluating time-restricted eating.

What to keep in mind

This was a secondary analysis, and dietary measures were available for 73 of the 88 randomized participants. The intervention lasted 12 weeks, limiting conclusions about longer-term dietary patterns.