Dinacharya and Circadian Cycle: A Conceptual Review of Ayurvedic Daily Karmas and their Modern Significance for Circadian Corrections

Abstract

Dinacharya, the Ayurvedic daily regimen, is a structured set of daily Karmas (practices) designed to align human physiology with natural cycles. Modern chronobiology describes similar health effects through circadian rhythms-24-hour biological cycles regulated by the suprachiasmatic nucleus (SCN), melatonin, cortisol, and peripheral clocks. Disruption of circadian timing is linked to metabolic, psychological, and sleep disorders. Objective: This conceptual review describes the key Karmas of Dinacharya, examines their modern physiological significance in relation to circadian biology, and discusses how Dinacharya-based interventions can correct or prevent circadian misalignment in contemporary lifestyles. Methods: Classical Ayurvedic texts and recent peer-reviewed reviews on Dinacharya, circadian rhythm, and chronobiology were conceptually analyzed. Practices were mapped to physiological markers such as cortisol awakening response, digestive enzyme secretion, body temperature rhythm, and melatonin onset. Results: Core Dinacharya karmas-including Brahma Muhurta waking, Mala visarjana, Dantadhavana, Jihva nirlekhana, Gandusha, Abhyanga, Vyayama, Udvartana, Snana, timed meals, and Ratricharya- show strong temporal and functional alignment with circadian physiology. Non-adherence mirrors circadian misalignment and is associated with obesity, diabetes, cardiovascular disease, depression, and sleep disorders. Conclusion: Dinacharya karmas represent an ancient, time-ordered behavioral framework that anticipates key principles of circadian biology. Systematic adherence, with pragmatic modifications for modern life, offers a preventive and corrective approach to circadian misalignment and lifestyle-related disorders.