wieviel gene hat der mensch — what can you do yourself?

The number of human genes is well established from the Human Genome Project: roughly 20,000–25,000 protein-coding genes, plus thousands of non-coding RNA genes. Exact counts vary by database (e.g., GENCODE lists ~19,000 protein-coding). What can you do yourself with this number? In daily life, very little – the raw gene count tells you nothing about health, diet, or performance. Consumer DNA tests often market polygenic scores for weight, sports, or longevity, but effect sizes are small and predictive power for individuals is weak (see context: marketing/unclear). Instead, focus on validated biomarkers (blood lipids, inflammation markers) and lifestyle factors (sleep, exercise, stress management). A DNA test may offer hints but should not replace medical advice. Caveat: Do not make drastic diet or supplement changes based solely on genetic testing.