What should I know about selbsttest?

Self-tests (e.g., DNA kits, breath analysis) promise quick health insights, but the scientific foundation is often weak. Many markers (like FTO, APOE, MTNR1B) show only small effect sizes and are not diagnostic. Results can be confounded by lifestyle, diet, and ancestry. A positive finding does not guarantee increased risk, and a negative one does not rule it out. Especially in children or as a substitute for medical check-ups, self-tests are not recommended. Evidence ranges from GWAS (human-moderate) to pure marketing claims. Without professional interpretation, users may make misguided decisions or experience unnecessary anxiety. My advice: treat self-tests as curiosity-driven hints, not medical facts. For any health concerns, consult a doctor or registered dietitian.