What role does LCT play in Stress?

The role of the LCT gene (lactase) in stress is not directly supported by scientific evidence. LCT encodes lactase, the enzyme that digests lactose. Indirect links are sometimes proposed: lactose intolerance can cause gastrointestinal discomfort, which may contribute to perceived stress via the gut-brain axis. Additionally, stress can alter gut permeability and microbiota, potentially affecting lactose digestion. However, no robust human studies demonstrate a causal or predictive role of LCT variants in stress responses. Evidence is limited to mechanistic speculation and isolated observations. Direct-to-consumer tests claiming a connection between LCT and stress are speculative. A balanced diet and stress management are advisable regardless of LCT genotype.