was ist ein genetischer ernährungstest — when to see a doctor?

A genetic nutrition test analyzes selected gene variants (SNPs) linked to nutrient metabolism, food intolerances, or weight regulation. Common examples include MTHFR (folate metabolism), FTO (obesity risk), and LCT (lactose intolerance). However, the scientific evidence for personalized diet recommendations from such tests is generally weak—most effects are small, not reproducible, or merely associative. These tests are often marketed as lifestyle products, not as medical diagnostics. When should you see a doctor? If you have specific symptoms (e.g., unexplained fatigue, digestive issues, rash) or if a lab value like homocysteine is elevated. Medical advice is also advisable if you are planning pregnancy or have chronic conditions. A genetic test alone does not replace a doctor's diagnosis. Before making major dietary changes or starting supplements, consult a physician—especially for MTHFR variants, where methylfolate is not proven superior to folic acid.