Is LCT useful for Langlebigkeit?

LCT encodes lactase, the enzyme that digests lactose. Lactase persistence (common in European populations) allows lifelong dairy consumption. Dairy provides calcium, vitamin D, and protein, which may support bone health and reduce fracture risk in older age – a factor in healthy longevity. Some observational studies link moderate dairy intake to lower cardiovascular mortality, but results are inconsistent. A 2019 meta-analysis found no clear association between dairy and all-cause mortality. Additionally, lactose intolerance can cause discomfort and may lead to avoidance of dairy, potentially affecting nutrient intake. MyBody-X DNA tests include LCT, but its direct utility for longevity is limited: it's one genetic variant among many. The evidence is mixed, and lifestyle factors like diet quality, exercise, and sleep are far more impactful. Therefore, LCT testing can inform personalized nutrition but should not be overinterpreted for longevity.