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Published on: June 13, 2025
Relationship Between Sleep and Meal Timing with Glycemia Parameters in Individuals with Obesity Participating in a
Sirimon Reutrakul1, Stacey L Simon2, Qi Wang3
1Department of Medicine, University of Illinois Chicago, Chicago, IL 60612, USA.
Nutrients
|June 12, 2026
Summary
Timing your meals in relation to sleep impacts glucose control in obesity. Longer morning fasting (Awake-First Meal) and evening fasting (Last Meal-Sleep) show benefits for glycemic parameters.
Area of Science:
- Metabolic Health
- Chronobiology
- Obesity Research
Background:
- Circadian misalignment, including mistimed sleep and eating, is linked to impaired glucose metabolism.
- The timing of the eating window is crucial for time-restricted eating (TRE) efficacy.
- Understanding meal-to-sleep timing is vital for managing glycemic control in individuals with obesity.
Purpose of the Study:
- To investigate the association between meal-to-sleep timing intervals and glycemic parameters.
- To analyze these associations in individuals with obesity undergoing TRE, caloric restriction (CR), or unrestricted eating (UE) interventions.
Main Methods:
- Secondary analysis of a 12-week randomized controlled trial involving participants with obesity.
- Interventions included TRE (8-hour eating window), CR, and UE.
- Continuous glucose monitoring (CGM) and actigraphy data were collected at baseline and end-intervention to assess glycemic outcomes and sleep patterns.
Main Results:
- A longer interval between awakening and the first meal (Awake-AM meal) was associated with lower overnight glucose, reduced glycemic variability, and improved time in target glucose ranges.
- A longer interval between the last meal and sleep onset (PM meal-Sleep) was associated with lower overnight average glucose.
- These associations remained significant after adjusting for baseline sleep duration, HbA1c, and intervention assignment.
Conclusions:
- Both morning and evening fasting periods relative to sleep differentially impact glycemic control in individuals with obesity.
- The findings underscore the importance of aligning eating patterns with sleep schedules for metabolic health.
- Results may guide optimal eating window selection for individuals practicing TRE and other dietary interventions.
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