ist kefir gut für den darm — what are common causes?

Kefir may support gut health due to its content of lactic acid bacteria, yeasts, and postbiotic metabolites. Studies suggest benefits for lactose intolerance, constipation, and inflammatory bowel conditions, but evidence is heterogeneous and depends on kefir type, individual microbiota, and dosage. Common causes of gut issues include low-fiber diet, chronic stress, antibiotic use, infections, food intolerances (e.g., lactose, fructose), and genetic factors (e.g., MCM6 variants for lactase persistence). Kefir is not a panacea; persistent symptoms warrant medical evaluation. The provided context lacks specific kefir studies, so this answer draws on general scientific literature. Evidence: human-moderate, as RCTs exist but not for all indications.