Lactose intolerance is the inability of adults and children to digest lactose, a sugar found in milk and to a lesser extent dairy products, causing side effects. Read about lactose intolerance, an inability to digest and absorb the sugar in milk. Symptoms include gas, diarrhea, and bloating. Living With Lactose Intolerance. Some people with lactose intolerance must avoid all foods containing lactose, but others can eat certain dairy foods. Lactose intolerance is usually the result of a lactase deficiency. Lactase is an enzyme (protein that causes a chemical reaction to occur) used to digest lactose. If you have lactose intolerance, you're not alone. Millions of Americans have the condition. Check out these tips on dealing with lactose intolerance. Treating lactose intolerance. There is no cure for lactose intolerance, but most people are able to control their symptoms by making changes to their diet. Lactose intolerance means the body cannot easily digest lactose, a type of natural sugar found in milk and dairy products. The ultimate information source on lactose intolerance - causes, treatments, and cures. Includes lactose free recipes, a survey, and blog. Lactose intolerance is an impaired ability to digest lactose, a sugar found in milk and other dairy products. Lactose is normally broken down by an enzyme. Explains the cause, risk factors, diagnostic tests, and management of lactose intolerance. Lists calcium-rich foods and foods that contain hidden lactose.