was bewirkt kefir am abend — what are common causes?

The question about the effects of kefir in the evening cannot be directly answered from the provided context, as it contains no specific studies or data on kefir. Generally, kefir is a fermented dairy product rich in probiotics (lactic acid bacteria and yeasts) and bioactive peptides. Potential evening effects may include improved digestion due to probiotics, but also bloating or discomfort, especially in individuals with lactose intolerance or irritable bowel syndrome. The context includes references to intolerance tests (IgG panels are not recommended) and a microbiome test that analyzes individual gut profiles. Kefir may theoretically support sleep due to its tryptophan content, which can promote melatonin production, but evidence is weak. Common causes of adverse reactions to kefir in the evening include lactose intolerance, histamine intolerance, or sensitivity to fermented foods. Without specific data from the context, the answer remains conservative: effects are individual and not sufficiently supported by the provided sources.