The Role of Circadian Rhythms in Human Health: Molecular Mechanisms and Therapeutic Strategies

Circadian rhythms are intrinsic biological processes that regulate critical physiological functions through molecular clocks found in the suprachiasmatic nucleus and peripheral tissues. This review synthesizes current understanding of the molecular mechanisms underlying circadian regulation, including core clock genes and their feedback loops, hormonal control involving melatonin and cortisol, and interactions with metabolic and neurochemical pathways. We explore the impact of circadian disruption on multiple human diseases, notably neurodegenerative disorders, cancer, metabolic syndrome, cardiovascular diseases, sleep disorders, and mental health conditions. Therapeutic strategies targeting circadian misalignment, such as melatonin supplementation, light therapy, pharmacological modulation of clock genes, and chrononutrition, are examined. Emerging directions include the role of the microbiome in circadian regulation and the potential for personalized medicine approaches leveraging circadian biology. Our review underscores the importance of circadian rhythms in health and disease and highlights promising avenues for innovative treatments aimed at restoring circadian homeostasis.