出典:Wikipedia
出典:『Wikipedia』 (2011/07/15 06:15 UTC 版)
Lactose intolerance, also called lactase deficiency, is the inability to digest and metabolize lactose, a sugar found in milk. It is caused by a lack of the enzyme lactase in the digestive system, required to break down lactose. It results in symptoms including abdominal pain, bloating, flatulence, diarrhea, nausea, and acid reflux.