wie viele gene hat der mensch — what can you do yourself?

The exact number of human genes is still under research, but current estimates are around 20,000–25,000 protein-coding genes. The provided context does not give a specific number. What you can do yourself: focus on modifiable factors like diet, exercise, sleep, and stress management. DNA tests like MyBody-X may offer hints, but the evidence for direct actionable advice is often weak or purely mechanistic. Don't be misled by single gene variants – most effects are small and can be influenced by lifestyle.