Evidence check: CLOCK in the context of Blutzucker

CLOCK gene variants (e.g., rs1801260, rs4580704) are part of the circadian rhythm system and influence glucose metabolism. GWAS and candidate gene studies suggest that certain alleles are associated with elevated fasting glucose, insulin resistance, and increased type 2 diabetes risk. However, effect sizes are small, and findings are not consistent enough to derive personalized dietary recommendations. Some studies indicate an interaction with meal timing: late eating may have a stronger impact on blood glucose in risk allele carriers. The evidence is mainly from observational studies and GWAS; randomized controlled trials for clinical utility are lacking. Consumer DNA tests that include CLOCK variants often overstate the clinical relevance. For blood sugar management, lifestyle factors such as sleep hygiene, regular meal timing, and physical activity remain paramount. A genetic test alone does not justify changes in diet or medication.