lactose

Key facts Lactose intolerance is when you can’t break down lactose. Lactose is the main sugar found in milk and other dairy products. Lactose intolerance happens when your body does not produce enough lactase — the enzyme that breaks down lactose. If you’re lactose intolerant, you don’t need to stop eating foods with lactose in them altogether. Milk allergy isn’t the same as lactose intolerance. What is lactose intolerance? Lactose intolerance is when you can’t break down lactose. Lactose is the main sugar found in milk made by mammals. Lactose can be found in: milk including evaporated milk, milk powder,