wie erkenne ich, ob ein selbsttest wissenschaftlich fundiert ist? — what can you do yourself?

To assess whether a self-test is scientifically sound, check these criteria: 1) What biomarkers are measured? Single SNPs like FTO rs9939609 have tiny effects (~0.3 kg/m² per allele) and are not diagnostic for obesity. 2) Is it an IgG food sensitivity test? IgG reflects exposure, not intolerance or allergy; such tests lack scientific validation. 3) Is the test marketed as a medical diagnostic? Many home tests are lifestyle products without clinical evidence. 4) Are there independent peer-reviewed studies? Absence of RCTs or meta-analyses is a red flag. 5) Is the test approved by a regulatory body (e.g., FDA, CE-IVD)? Without certification, results can be misleading. In summary: a sound test shows reproducible, clinically meaningful effects and is endorsed by medical societies. When in doubt, consult a healthcare professional.