What does a LCT genotype mean for lifestyle?

The LCT genotype (rs4988235) determines whether lactase production continues into adulthood. The 'lactase persistence' variant (T allele) allows most people to digest lactose without issues. The 'non-persistence' variant (C allele) often leads to lactose intolerance, causing bloating, diarrhea, or cramps after dairy consumption. For lifestyle, this means: if you have the non-persistent genotype, choosing lactose-free or low-lactose products, or using lactase supplements, can help. However, many individuals tolerate small amounts of lactose (e.g., hard cheese, yogurt) well. The genotype alone does not dictate a strict diet – personal tolerance and habits matter greatly. The impact on bone health is indirect: if dairy is avoided, ensure adequate calcium and vitamin D intake. Evidence linking genotype to lactase activity is strong, but lifestyle adaptation is highly individual. A DNA test provides a clue, not a diagnosis; medical advice is recommended for persistent symptoms.