Can LCT help with gut health?

Whether LCT (lactase gene) can help with gut health requires nuance. LCT encodes lactase, the enzyme that breaks down lactose. Variants (e.g., LCT-13910 C/T) determine lactase persistence or non-persistence. In lactose intolerance, dairy consumption can cause bloating, diarrhea, and abdominal pain – symptoms that impair gut health. A low-lactose diet or lactase supplementation can alleviate these issues. However, the direct impact of LCT on broader gut health (e.g., microbiome composition, inflammation) is indirect and not supported by strong clinical evidence. The evidence for LCT-based interventions improving gut symptoms is moderate (human-moderate). Direct-to-consumer tests like MyBody-X can detect LCT variants, but clinical relevance depends on symptoms and confirmation. Caveat: LCT alone is not a comprehensive gut health marker; diet, microbiome, and inflammatory markers are more critical.