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Lactose intolerance is caused by a lessened ability or a complete inability to digest lactose, a sugar found in dairy products. [1] Humans vary in the amount of lactose they can tolerate before symptoms develop. [1] Symptoms may include abdominal pain, bloating, diarrhea, flatulence, and nausea. [1]
Milk allergy is an adverse immune reaction to one or more proteins in cow's milk.Symptoms may take hours to days to manifest, with symptoms including atopic dermatitis, inflammation of the esophagus, enteropathy involving the small intestine and proctocolitis involving the rectum and colon. [2]
An estimated 50 million people in the U.S. have some kind of allergy. Not every allergy lasts a lifetime, however.
Lactase persistence or lactose tolerance is the continued activity of the lactase enzyme in adulthood, allowing the digestion of lactose in milk. In most mammals , the activity of the enzyme is dramatically reduced after weaning . [ 1 ]
Some also say it can be easier to digest than cow’s milk, though lactose intolerance issues may still arise, and, of course, it’s still unappealing for those trying to avoid animal products.
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Lactose intolerance generally develops later in life, but can present in young patients in severe cases. It is not an immune reaction and is due to an enzyme deficiency ( lactase ). It is more common in many non-Western people.
You can outgrow an allergy as you age—or develop a new one.
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