Why does bacterial overgrowth primarily occur in the small intestine after gastrectomy?

💡 Explanation

After gastrectomy, reduced motility in the small intestine impairs the normal peristaltic clearance of bacteria, leading to bacterial overgrowth, because peristalsis is the primary mechanism for preventing bacterial stasis. Therefore, bacterial overgrowth occurs, rather than being prevented by lymphatic flow or increased transit time.

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