Myths vs facts: CLOCK and longevity

The CLOCK gene is a core component of the circadian clock. Myths often claim that specific variants directly determine longevity. Facts: Studies have found modest associations between CLOCK polymorphisms (e.g., rs1801260) and metabolic traits like obesity, insulin resistance, and type 2 diabetes, which can indirectly affect healthspan. However, effect sizes are small and heavily modulated by lifestyle factors (light exposure, sleep timing, diet). A DNA test alone cannot predict your lifespan. Evidence level: human-moderate – replicated associations exist, but causal evidence is lacking. Consumer tests tend to overstate clinical utility. Practical takeaway: prioritize consistent sleep-wake cycles, morning light exposure, and avoiding circadian disruption. A CLOCK gene test may offer a nudge, but it is not a substitute for healthy habits.