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Lactose intolerance is the ancestral state of all humans before the recent evolution of lactase persistence in some cultures, which extends lactose tolerance into adulthood. [9] Lactase persistence evolved in several populations independently, probably as an adaptation to the domestication of dairy animals around 10,000 years ago.
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 ]
The study also shows how Xiaohe people, who were known to be genetically lactose intolerant, consumed dairy before the era of pasteurization and refrigeration, as cheese production lowers lactose ...
It breaks down the sugar lactose into its component parts, galactose and glucose. Lactase is found in the brush border of the small intestine of humans and other mammals. People deficient in lactase or lacking functional lactase may experience the symptoms of lactose intolerance after consuming milk products. [1]
Lactose intolerance is a condition in which people have symptoms due to deficiency or absence of the enzyme lactase in the small intestine, causing poor absorption of milk lactose. [ 123 ] [ 124 ] People affected vary in the amount of lactose they can tolerate before symptoms develop, [ 123 ] which may include abdominal pain, bloating ...
Many adults are lactose intolerant because their bodies cease production of the enzyme lactase post childhood. However, mutations in the promoter region of the lactase gene (LCT) result in the continued production of lactase throughout adulthood in certain African populations, a condition known as lactase persistence. A study conducted by Sarah ...
New results suggested that some adult Neanderthals were lactose intolerant. [9] On the question of potentially cloning a Neanderthal, Pääbo commented, "Starting from the DNA extracted from a fossil, it is and will remain impossible." [7] In May 2010, the project released a draft of their report on the sequenced Neanderthal genome.
Lactose Intolerance in dogs looks similar to lactose intolerance in humans, with a myriad of digestive symptoms to deal with. Common symptoms of lactose intolerance in dogs include: - Diarrhea and ...