Is Nährstoffcheck useful for Langlebigkeit?

The MyBody-X Nährstoffcheck (nutrient check) measures blood biomarkers such as vitamin D, B12, iron, and may include DNA variants like FUT2 for B12 absorption. Identifying and correcting nutrient deficiencies can support energy, immunity, and bone health—factors that contribute to healthspan. However, longevity is not a directly measurable endpoint. Evidence for lifespan extension through nutrient optimization alone is moderate and based on observational studies. Correcting a deficiency is beneficial, but a single test does not replace ongoing medical evaluation. Blood levels fluctuate diurnally and are a snapshot. DNA-based dietary advice often has small effect sizes. Conclusion: The check can be useful as part of a holistic longevity strategy, but it is not a standalone longevity test. Evidence: human-moderate. Sources: none specific in context.