wie oft kefir trinken — what are common causes?

The question about how often to drink kefir and 'common causes' is not addressed in the provided context. From general nutritional science: kefir is a fermented dairy product rich in probiotics (bacteria and yeasts). A daily intake of 100–200 ml (about one small glass) is commonly recommended to support gut microbiota without excessive calories or sugar. Common reasons for consumption include: improving digestion, alleviating lactose intolerance (fermentation reduces lactose), boosting immune function, and promoting overall gut health. Some also drink kefir for its B‑vitamins, vitamin K2, and minerals. 'Common causes' could also refer to adverse effects: excessive intake (e.g., >500 ml/day) may cause bloating, diarrhea, or temporary gut adjustment. People with histamine intolerance or compromised immunity should be cautious. Evidence for specific health claims is moderate; effects vary individually. Since the context lacks kefir-specific data, this answer relies on general practice. Evidence: practice.