Final answer:
Lactose intolerance is caused by a lack of lactase enzyme leading to symptoms like diarrhea and bloating.
Explanation:
Lactose intolerance occurs when there is a deficiency of the enzyme lactase needed to break down lactose in milk. This undigested lactose moves to the large intestine, where intestinal bacteria ferment it, producing gases and leading to symptoms like diarrhea, bloating, and cramps.
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