Kefir Darm: what are common causes?

Kefir can cause digestive discomfort in some individuals. Common reasons include: lactose intolerance (kefir has less lactose than milk but not zero), histamine intolerance (kefir is histamine-rich), too rapid introduction of probiotics leading to temporary bloating/gas, or sensitivity to milk proteins. Overconsumption may also cause diarrhea or fullness. In most cases symptoms are mild and resolve after an adaptation period. Persistent issues warrant medical evaluation. Evidence is based on clinical practice and mechanistic understanding, not large RCTs.