The video explains the normal digestion process and how diarrhea disrupts it by preventing nutrient and water absorption. It discusses various causes of diarrhea, including lactose intolerance and unhygienic food, and describes the body's response to pathogens. The role of peristalsis and the enteric nervous system in gut motility is highlighted. The video concludes with advice to consult a doctor for ongoing diarrhea issues.

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