sugar in milk and milk products. Some people's bodies do not make enough lactase, so they are not able to digest milk well. These people are said to have "lactase deficiency" and are called "lactose intolerant." They can take supplemental lactase to help them break down lactose and tolerate milk. In these people lactase can prevent symptoms of lactose intolerance including cramps, diarrhea, and gas.
Many health experts think it's important to treat lactose intolerance so people can consume milk and milk products. Milk is a major source of calcium, which is needed for strong bones. People who do not get enough milk are more likely than other people to develop weak bones (osteoporosis).
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