What do studies say about Kefir Alltag?

The provided context does not include any studies specifically about kefir in daily life. Generally, kefir is a fermented milk product rich in probiotics, and some research suggests benefits for gut health, lactose digestion, and immune modulation. However, evidence quality varies; many studies are small or observational. Without relevant context from your documents, I cannot give a detailed answer grounded in your sources. For a balanced view, consult systematic reviews (e.g., PMID: 30787436) and consider that individual responses to probiotics differ. Evidence level: unclear due to lack of context.