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Relative Effects of Time-Restricted Eating, Energy-Restricted Eating, and Unrestricted Eating on Eating Patterns and
Lisa J Harnack1, Niki Oldenburg2, Qi Wang3
1Division of Epidemiology and Community Health, School of Public Health, University of Minnesota, 1300 South 2(nd) Street Suite 300, Minneapolis, MN 55454.
Journal of the Academy of Nutrition and Dietetics
|March 18, 2026
Summary
Time-restricted eating (TRE) reduced daily meals and decreased energy and saturated fat intake, similar to energy-restricted (ER) diets. TRE did not significantly differ from ER diets in overall food and nutrient intake changes.
Area of Science:
- Nutrition Science
- Dietary Interventions
- Obesity Research
Background:
- Time-restricted eating (TRE) shows promise for weight loss, potentially matching energy-restricted (ER) diets.
- Limited data exists on TRE's impact on eating patterns and overall dietary intake.
- Understanding these effects is crucial for optimizing weight management strategies.
Purpose of the Study:
- To compare the effects of TRE, ER, and unrestricted eating (UE) on eating patterns and dietary intake.
- To analyze changes in meal frequency, food group consumption, and nutrient intake across different dietary interventions.
- To provide insights into the efficacy of TRE versus ER diets.
Main Methods:
- Secondary analysis of a randomized controlled trial (RCT) involving 88 participants with obesity.
- Interventions included an 8-hour TRE, a 15% ER diet, and unrestricted eating (UE) over 12 weeks.
- Dietary intake, including meals, food groups, and nutrients, was assessed using validated measures.
Main Results:
- TRE significantly reduced daily meals and breakfast frequency compared to baseline.
- Participants in the TRE group showed significant decreases in energy, saturated fat, potassium, and grain intake.
- No significant differences in food and nutrient intake changes were observed between TRE and ER groups.
Conclusions:
- TRE, with an 8-hour window and ad libitum intake, demonstrates comparable effects on food and nutrient intake to traditional ER diets.
- TRE may be a viable alternative for individuals seeking weight management without strict energy limitations.
- Further research can explore long-term adherence and broader health outcomes of TRE.
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