wie oft sollte man kefir trinken — which blood markers matter?

There is no strong evidence for a specific optimal frequency of kefir consumption. Common recommendations suggest 1–2 servings (about 150–250 ml) per day, based on general probiotic and fermented dairy guidelines. Regarding blood markers, the relevant ones depend on your health goals: for cardiovascular effects, monitor LDL cholesterol, HDL, triglycerides, and hs-CRP. For metabolic effects, fasting glucose and HbA1c are useful. Kefir contains probiotics and bioactive peptides that may reduce inflammation, but individual responses vary. A vitamin D test (as offered by MyBody-X) is not directly linked to kefir but could be relevant if you consume fortified products. Important: kefir is not a drug. If you have existing conditions or take immunosuppressants, consult a doctor first. The evidence is mostly mechanistic and observational; robust randomized controlled trials with hard endpoints are lacking.