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The digestive system is unable to process the lactose sugar, and the unprocessed sugars in the gut produce the symptoms of lactose intolerance. Lactose intolerance is not an allergy , because it is not an immune response, but rather a sensitivity to dairy caused by a deficiency of lactase enzyme.
The ability to digest lactose is not an evolutionary novelty in human populations. Nearly all mammals begin life with the ability to digest lactose. This trait is advantageous during the infant stage, because milk serves as the primary source for nutrition. As weaning occurs, and other foods enter the diet, milk is no longer consumed.
In fact, about 36% of Americans and 68% of people in the world have lactose intolerance. The rest might have a special gene and are able to continue digesting milk into adulthood.
Lactose intolerance in infants (congenital lactase deficiency) is caused by mutations in the LCT gene. Mutations are believed to interfere with the function of lactase, causing affected infants to have a severely impaired ability to digest lactose in breast milk or formula. [24]
Cream contains high levels of lactose, which is a sugar found in dairy products. People who are lactose intolerant lack the ability to digest lactose. Anderson’s Frozen Custard
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This is an autosomal recessive disorder and infants that can’t break down lactose have trouble with breastmilk, and develop diarrhea starting from birth. Sometimes, even those with lactase-persistence can develop temporary lactose intolerance as a result of infection or inflammation in the small intestine.
And if so does it mean you can never eat chips?