wie erkenne ich, ob ein selbsttest wissenschaftlich fundiert ist? — what does this mean exactly?

To assess whether a self-test is scientifically sound, examine several criteria. First, what is the underlying evidence? Many genetic tests (e.g., rs174546 in FADS1) are based on GWAS, which show associations but often with small effect sizes – diet usually matters more. Second, does the test clearly separate correlation from causation? A test for rs1800629 (TNF) may indicate higher inflammatory tendency, but that does not automatically mean vitamin D supplements are needed. Third, are limitations stated? MyBody-X tests, according to context, are not medical diagnostic tools; they provide 'neutral insights' without clinical evaluation. For example, a hormone test measures only total testosterone, not free testosterone, so it cannot diagnose low T. Fourth, are independent sources cited? If PMIDs or guidelines are missing, be cautious. Watch for overclaims: a microbiome test boasting 'over 1,500 bacterial species' sounds impressive, but the clinical relevance of many species is unclear. In summary, a credible test states its evidence level, provides caveats, and advises against supplementing based on genetics alone.