Myths vs facts: LCT and Fruchtbarkeit

Claims that the LCT gene (lactase persistence) directly affects fertility are not scientifically supported. LCT variants determine whether lactose can be digested in adulthood. Some studies explore links between dairy intake and fertility, but these are indirect and not attributable to single genes. Lactose intolerance may lead to nutrient deficiencies (e.g., calcium, vitamin D) that could theoretically impact fertility, but no randomized controlled trials demonstrate a causal effect of LCT on fertility outcomes. The evidence is therefore rated as 'unclear'. Consumers should not rely on genetic tests for fertility optimization but instead focus on a balanced diet and medical advice.