Lactose is a natural sugar found in milk and milk products. Normally, after you eat or drink something that has it, an enzyme in your intestine called lactase breaks it down. But people with lactose intolerance don’t make enough of this enzyme. So the undigested lactose ends up in the colon, where bacteria start to ferment it. That process can be very uncomfortable, causing symptoms like bloating, gas, pain, nausea, and diarrhea.
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