Weekday, but not weekend, alignment of physical activity and meal timing with chronotype was modestly associated with more favourable glucose metabolism, suggesting a potential role of behaviour-chronotype alignment in metabolic health.
Key Findings
Results
Weekday alignment of physical activity timing with chronotype was associated with lower HbA1c levels.
β per 20% more aligned weekdays: -0.48%, 95% CI -0.95, -0.02
Cross-sectional analysis of 1384 participants from The Maastricht Study
Physical activity timing was assessed by accelerometry and defined as the daypart with the highest step count
Chronotype was estimated using the midpoint of sleep on free days corrected for sleep debt (MSFsc)
Association was observed for HbA1c but not for fasting plasma glucose (FPG) or 2-hour post-load glucose (2hPLG)
Results
Weekday meal timing alignment with chronotype was associated with lower odds of prediabetes or type 2 diabetes.
OR aligned vs. misaligned: 0.62, 95% CI 0.43-0.89
Meal timing was defined as the daypart with the most eating occasions, assessed via a chrono-nutrition questionnaire
No significant associations were observed for FPG or 2hPLG in relation to meal timing alignment
The association was specific to weekday alignment; weekend alignment showed no significant association
Results
Weekend alignment of either physical activity or meal timing with chronotype was not significantly associated with any glycaemic parameters.
No significant associations were observed for weekend physical activity timing alignment with HbA1c, FPG, or 2hPLG
No significant associations were observed for weekend meal timing alignment with prediabetes or T2DM odds
This contrasts with the significant weekday findings, suggesting a weekday-specific effect
Results
No significant interaction was found between physical activity timing alignment and meal timing alignment on glucose metabolism outcomes.
The study specifically tested for interactions between activity and meal timing alignment
No significant interaction terms were identified for any glycaemic parameter
This suggests the associations of physical activity and meal timing alignment with glucose metabolism may operate independently
Methods
The study used a cross-sectional design with confounder-adjusted logistic and linear regression models to assess behaviour-chronotype alignment and glucose metabolism.
Sample size was 1384 participants from The Maastricht Study
Glycaemic outcomes included fasting plasma glucose (FPG), 2-hour post-load glucose (2hPLG), HbA1c, and prediabetes or T2DM status
Physical activity timing was measured objectively via accelerometry
Log-transformed FPG, 2hPLG, and HbA1c were used as continuous outcomes in linear regression models
Alignment reflected concordance between behaviour timing (daypart) and chronotype
What This Means
This research suggests that when people's daily habits — specifically when they exercise and when they eat — align with their natural body clock (chronotype, i.e., whether someone is a morning or evening person), they tend to have better blood sugar regulation. Using data from over 1,300 participants, researchers found that people whose physical activity peaked during a time of day consistent with their chronotype had lower HbA1c levels (a measure of average blood sugar over several months), and people whose main eating occasions aligned with their chronotype had about 38% lower odds of having prediabetes or type 2 diabetes compared to those who were misaligned.
Importantly, these associations were only found for weekday behaviors, not weekends. This could reflect the fact that weekday schedules are more structured and consistently repeated, making alignment — or misalignment — more metabolically impactful over time. The study did not find that combining aligned physical activity and meal timing had any additional benefit beyond each factor separately, and associations were not seen for all blood sugar measures (fasting glucose and post-meal glucose were not significantly affected).
Because this study was cross-sectional (a snapshot in time rather than following people over time), it cannot prove that misalignment causes worse blood sugar control. However, the findings add to growing evidence that not just what people do, but when they do it relative to their internal clock, may matter for metabolic health. The authors call for prospective and intervention studies to confirm whether adjusting the timing of exercise and meals to better match one's chronotype could help prevent or manage conditions like type 2 diabetes.
Chong M, Henson J, Bours M, Bosma H, de Galan B, van der Kallen C, et al.. (2026). Physical activity and meal timing alignment with chronotype and their associations with glucose metabolism: The Maastricht Study.. Diabetes, obesity & metabolism. https://doi.org/10.1111/dom.70526