wie lang ist der menschliche darm — what are common causes?

The human intestine typically measures 7–9 meters in total (small intestine ~6–7 m, large intestine ~1.5 m). Common causes of variation include surgical resection (e.g., for Crohn's disease or cancer), inflammatory bowel disease leading to shortening or strictures, and congenital anomalies. Age-related atrophy can also reduce length. Genetic factors play a minor role but are poorly characterized. Direct-to-consumer DNA tests claiming to predict gut length lack clinical validation. For accurate assessment, imaging or surgical records are required. Evidence: mechanistic, not supported by strong human studies.