welche mineralien braucht der körper — which blood markers matter?

The body requires a range of minerals for essential functions: calcium for bones and muscle contraction, magnesium for enzymatic reactions and heart rhythm, potassium and sodium for nerve conduction and fluid balance, iron for oxygen transport, zinc for immunity and wound healing, selenium for antioxidant processes, and iodine for thyroid function. Blood markers that reflect mineral status include serum calcium, magnesium, potassium, sodium, ferritin and transferrin saturation (iron), zinc, selenium, and possibly intracellular magnesium. The provided context (DNA tests, vitamin D self-test, FOXO3 SNP) does not contain direct evidence about minerals or their blood markers. Evidence for the clinical utility of these markers varies: serum calcium is well-established, while zinc or selenium measurements are methodologically challenging. Consumer blood tests (e.g., MyBody-X) may offer rough guidance but are not substitutes for medical laboratory diagnostics. If a deficiency is suspected, a physician-ordered lab with validated reference ranges is recommended. Genetic analysis (e.g., FOXO3) has no direct link to mineral metabolism. Conclusion: a balanced diet usually meets mineral needs; blood markers should be interpreted cautiously and only when clinically indicated.