Many adults lack the ability to digest the milk sugar, lactose. Often, this is due to the insufficient production of the enzyme lactase, which breaks down lactose. This is not due to an allergy to milk. Milk allergies are different because they
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are often not harmful to the person
result in a build-up of the substance in the body
are the result of the digestive system attacking the substance
result from an overreaction of the immune system to a harmless substance