How are CLOCK and weight loss related?

CLOCK (Circadian Locomotor Output Cycles Kaput) is a core circadian gene that regulates the body's internal clock. Variants in CLOCK have been linked to energy metabolism, appetite hormones (ghrelin, leptin), and weight loss outcomes. For example, the rs1801260 polymorphism is associated with later sleep timing and reduced weight loss success in some studies. However, effect sizes are small, and findings are inconsistent across populations. DNA tests can report these variants, but they do not predict individual weight loss reliably. Weight management depends primarily on diet quality, caloric deficit, physical activity, and sleep hygiene. Evidence level: human-moderate (observational studies, some GWAS). Caveat: No direct clinical recommendation; lifestyle interventions remain key. Consider consulting a registered dietitian for personalized advice.