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Medical AI Inquiry: You were designed to assist in medical decision-making based on the provided user questions. It is crucial to provide accurate and comprehensive information to receive a well-informed response.
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One patient with chronic diarrhea noticed improvement in symptoms after prolonged fasting. He is most probably suffering from:
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The correct answer is  The demonstration of the effect of prolonged (>24 h) fasting on stool output can be very effective to differentiate osmotic and secretory diarrhea. A secretory (enterotoxin-induced traveler's) diarrhea is not affected by prolonged fasting. Diarrhea secondary to lactose malabsorption would cease during a prolonged fast. Ref: Harrison, E-18, P-2460.