Can LCT help with longevity?

There is no robust scientific evidence that the LCT gene (lactase) directly influences longevity. LCT determines adult lactose tolerance, which may have offered a nutritional advantage in some historical populations, but modern longevity is multifactorial. The provided context does not cite any studies linking LCT to lifespan. MyBody-X tests are marketed as lifestyle inspiration, not medical diagnostics. Any indirect benefit (e.g., avoiding lactose if intolerant) is plausible but not validated for longevity. Evidence level: marketing/unclear. Do not rely on consumer DNA tests for life extension decisions; consult a healthcare professional.