Circadian rhythm modulation in metabolic disease: targeting clock genes for obesity and insulin resistance

Circadian rhythms are intrinsic 24-hour cycles that coordinate key metabolic processes, including glucose homeostasis, lipid metabolism, and energy expenditure. Disruption of these rhythms, due to sleep disturbances, shift work, or irregular feeding schedules, contributes to the development of obesity, insulin resistance, and dyslipidemia. Core clock genes, including circadian locomotor output cycles kaput (CLOCK), brain and muscle ARNT-like 1 (BMAL1), period gene (PER), and cryptochrome (CRY), play a central role in orchestrating these metabolic pathways. Chronotherapy, aligning lifestyle, behavioral, and pharmacologic interventions with circadian timing, represents a promising, yet underexplored, strategy for metabolic disease management. Evidence suggests that interventions such as time-restricted feeding, light therapy, pharmacologic modulators of clock gene expression, and wearable technology can improve glucose control, lipid profiles, and body weight. This review synthesizes current knowledge on the molecular regulation of metabolism by circadian clocks, elucidates mechanistic links between rhythm disruption and metabolic dysfunction, and explores translational strategies to restore circadian homeostasis. By targeting circadian rhythms, personalized and cost-effective interventions can be developed to mitigate the global burden of metabolic disorders. Future research should focus on large-scale clinical trials, precision chronotherapy, and integration of wearable devices to optimize the timing of interventions, ultimately enhancing treatment efficacy and long-term metabolic health.