Lactose intolerance

When you have lactose intolerance you have a reduced ability to absorb lactose, ie milk sugar from the food. This is because the intestinal mucosa has a lower level of an enzyme, lactate, which is required for the milk sugar to be broken down and taken up by the small intestine. With a lowered level of lactase, milk sugar will instead end up in the large intestine and will be broken down by bacteria, which can cause pain, diarrhea and gas formation.