How are LCT and fertility related?

The relationship between the LCT gene (lactase persistence) and fertility is not well established in scientific literature. LCT variants determine whether adults can digest lactose (lactase persistence) or not (lactose intolerance). Some speculative hypotheses suggest that lactose intolerance might affect calcium and vitamin D intake – nutrients important for reproductive health. However, no robust human studies demonstrate a direct causal effect of LCT genotypes on fertility outcomes such as conception rates, hormone levels, or sperm quality. The evidence remains at the mechanistic and indirect nutritional level. Therefore, a consumer DNA test for LCT cannot provide meaningful information about personal fertility. Anyone concerned about fertility should consult a healthcare provider for proper clinical evaluation, not rely on genetic testing for such complex traits.