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Earlier or more regular eating patterns, postprandial physical activity, and stable sleep-wake schedules are associated with more favorable cardiometabolic profiles, but integrated eating-activity-sleep coherence is not yet validated.

This narrative review proposes 'rhythm coherence' as a framework for the temporal stability and alignment of eating, physical activity, and sleep. Based on a staged evidence-identification process, 131 high-priority records were synthesized, and selected studies showed associations between regular eating, postprandial activity, and stable sleep with better cardiometabolic profiles. However, the evidence is heterogeneous and does not establish an effect of the integrated framework or the proposed Rhythm Coherence Index (RCI).

Last updated: Aug 15, 2026•0 RCTs•📖 Read as article →

Evidence Score

Evidence Score32/100
Human RCT☆☆☆☆☆
Meta-analysis☆☆☆☆☆
Mechanism★★★★★
Safety★★★★☆
Confidencelow

Study Evidence

Study 1. Dietary Behavior, Physical Activity, and 24-Hour Rhythm Coherence: A Digital Phenotyping Perspective on Vascular and Glycemic Health.

observational

Sun G, Jia X, Zhang H, Yu R, Rong S, Liu Y, Qi Y, Chen S · Nutrients (2026)

Participants: N/A
Duration: N/A
Intervention: Not applicable (review of observational and interventional studies on timing and regularity of eating, activity, and sleep)
Outcome: Cardiometabolic profiles (vascular and glycemic health markers)
Effect Size: N/A
Population: General population (including athletes in targeted searches)

Result:

PubMed: 42588170DOI: 10.3390/nu18152546

Mechanism Graph

Eating timing and regularity influence circadian metabolic rhythms
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Postprandial physical activity modulates post-meal glucose excursions
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Stable sleep-wake schedules reinforce circadian alignment
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Coherent timing across behaviors may improve cardiometabolic health

Limitations

  • ⚠Narrative review with heterogeneous evidence (mechanistic, observational, interventional)
  • ⚠RCI is an author-proposed composite, not validated; requires prospective evaluation of formula, weights, thresholds, reliability, and predictive value

Frequently Asked Questions

What is rhythm coherence?▼

Rhythm coherence is a proposed framework describing the temporal stability and alignment of eating, physical activity, and sleep across the 24-hour cycle.

Is the Rhythm Coherence Index (RCI) a validated tool?▼

No, the RCI is an author-proposed candidate composite and is not yet validated for clinical use. Its formula, weights, missing-data procedures, thresholds, reliability, and predictive value require prospective evaluation.

What evidence supports the association between meal timing and cardiometabolic health?▼

Selected studies suggest that earlier or more regular eating patterns are associated with more favorable cardiometabolic profiles, but the evidence is heterogeneous and not conclusive.

Does this review establish that integrated eating-activity-sleep coherence improves health?▼

No, the review supports further investigation but does not establish an effect of the integrated framework. Numerical effects from individual interventions should not be attributed to the integrated framework or RCI.

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References

  1. 1.Sun G, Jia X, Zhang H, Yu R, Rong S, Liu Y, Qi Y, Chen S. "Dietary Behavior, Physical Activity, and 24-Hour Rhythm Coherence: A Digital Phenotyping Perspective on Vascular and Glycemic Health.." Nutrients, 2026. PMID: 42588170 DOI: 10.3390/nu18152546
Disclaimer: This content is for educational purposes only and is not medical advice. Evidence scores reflect the quality and quantity of available research, not clinical recommendations. Always consult a healthcare professional before starting any supplement or intervention.