How are LCT and Wechseljahre related?

The relationship between LCT (lactase gene) and menopause (Wechseljahre) is not well-established by strong human evidence, but plausible mechanisms exist. LCT determines lactase persistence, i.e., the ability to digest lactose in adulthood. During menopause, declining estrogen levels can alter gut microbiota composition and intestinal barrier function, potentially leading to secondary lactose intolerance in some women. However, most studies do not find a direct causal link between menopause and lactase activity changes. Genetic tests for LCT variants (e.g., rs4988235) indicate lifelong lactase persistence, which is not affected by menopause. Therefore, a genetic test alone cannot predict menopausal lactose issues. Consumer DNA tests like those from MyBody-X can reveal your genetic predisposition, but they do not account for hormonal or microbiome shifts. If you experience digestive discomfort during menopause, consider a lactose elimination trial or consult a doctor rather than relying solely on genetic results. Evidence for a direct LCT–menopause connection is weak and mostly mechanistic or anecdotal.