welche mikronährstoffe sollte man testen lassen — which blood markers matter?

The question of which micronutrients and blood markers to test is valid, but the answer depends heavily on individual risk factors, symptoms, and diet. The provided contexts primarily discuss genetic tests (FTO, MTHFR, CYP1A2, SLC6A4, BDNF) and their often overestimated relevance for weight, stress, or sports. No direct recommendations for specific micronutrient blood markers are given. From an evidence-based perspective, some markers are generally useful: vitamin D (25-OH-D), vitamin B12, ferritin (iron status), folate (especially relevant with MTHFR variants), and possibly selenium, zinc, or magnesium in certain risk groups. A full micronutrient panel without clinical indication is usually unnecessary and can lead to misinterpretation. The predictive power of genetic tests for individual nutrient needs is often weak; blood analysis provides more direct information. Caveat: Many commercial tests overstate clinical relevance. Medical consultation before and after testing is essential.