wie lange ist der darm — when to see a doctor?

The length of the human intestine varies individually but averages about 7–9 meters (small intestine ~5–7 m, large intestine ~1.5 m). This number alone is not clinically relevant. You should see a doctor if you experience persistent symptoms such as abdominal pain, bloating, diarrhea, constipation, blood in stool, unexplained weight loss, or changes in bowel habits. The provided context does not contain specific information about intestinal length or when to see a doctor. This answer is based on general medical practice. A DNA or microbiome test cannot replace a medical diagnosis – for serious symptoms, consult a gastroenterologist.