What to watch with LCT and longevity?

The LCT variant (e.g., rs4988235) determines adult lactase persistence – a classic gene–environment interaction. For longevity, there is no direct, robust evidence. Some studies suggest links between dairy intake, calcium absorption, and reduced risk of osteoporosis or colorectal cancer, but effects are small and population-dependent. Additionally, lactose intolerance can cause bloating, diarrhea, and nutrient malabsorption, which might indirectly affect health. Longevity research focuses more on genes like FOXO3, SIRT1, or telomere length – not LCT. If you are lactose intolerant, avoiding dairy or choosing lactose-free options is sensible, but this has no proven impact on lifespan. Overall, the connection between LCT and longevity is speculative, based on indirect, mechanistic, or population-level observations. Personalized dietary advice is reasonable, but exaggerated longevity claims are not evidence-based.