wann trinkt man am besten kefir — can a microbiome test help?

The best time to drink kefir is not clearly established by scientific evidence. Traditionally, kefir is often recommended on an empty stomach in the morning so that probiotics can reach the gut undisturbed. Others suggest consuming it with meals to aid digestion. A microbiome test (e.g., stool analysis) can reveal your gut bacteria composition – for instance, if certain strains are underrepresented. In theory, you could then select a kefir with matching strains. However, the evidence for personalized timing recommendations based on such tests is weak. Most probiotic studies use fixed dosing without individual timing adjustments. Moreover, consumer microbiome tests are often not sufficiently validated for clinical decisions. Individuals with lactose intolerance (e.g., rs4988235 variant) usually tolerate kefir better than milk due to its lower lactose content. Bottom line: kefir is healthy, but a microbiome test currently does not provide a reliable answer to the question 'when to drink it.' Evidence: unclear.