wann kefir trinken — can a DNA test help?

The question of when to drink kefir cannot be answered universally, as it depends on individual factors such as lactose tolerance, gut microbiome composition, and personal health goals. A DNA test, such as those offered by MyBody-X, can provide clues but not definitive instructions. The most relevant genetic marker is the LCT polymorphism (rs4988235), which determines lactase persistence into adulthood. Individuals with the CC genotype (lactase non-persistence) produce less lactase after childhood and may have difficulty digesting lactose. Kefir contains less lactose than milk, but not zero – sensitive individuals may still experience bloating or diarrhea. However, the evidence for direct, DNA-based dietary recommendations is moderate at best: effect sizes are modest, and many other factors (gut microbiome adaptation, concurrent conditions, habitual intake) play a larger role. MyBody-X tests are not diagnostic and are regulated under German GenDG law. Thus, a DNA test can indicate a predisposition for lactose intolerance, but the decision of when and how much kefir to consume should be based on personal tolerance and, if needed, medical advice. For most people with mild lactose intolerance, kefir is often better tolerated than milk due to fermentation and probiotic content, and may even support digestion. A DNA test is a useful piece of the puzzle, but not a standalone guide.