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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 ]
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 ] Some population segments exhibit lactase persistence resulting from a mutation that is postulated to have occurred 5,000–10,000 years ago, coinciding with the rise ...
Some populations have developed genetic changes to allow the digestion of lactose: lactase persistence. [78] Other populations developed cooking methods like milk fermentation. [78] Lactase persistence in humans evolved relatively recently (in the last 10,000 years) among some populations.
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Lactose, or milk sugar, is a disaccharide composed of galactose and glucose and has the molecular formula C 12 H 22 O 11. Lactose makes up around 2–8% of milk (by mass). The name comes from lact (gen. lactis ), the Latin word for milk, plus the suffix -ose used to name sugars.
Well, this group historically has domesticated cows and other milk providers and consumed lactose-based, or milk-based products into adulthood, and by natural selection, it’s thought that they’ve developed increased persistence of lactase production by specific gene mutations that are often autosomal dominant.
Since puppies drink their mother's milk, their bodies produce lactase, an enzyme that helps them digest the lactose sugars found in milk. Once they are weaned, however, they stop producing this ...
With the increasing consumption of milk products these societies developed a lactase persistence by epigenetic inheritance, which means that the milk-digesting enzyme lactase was present in their bodies during the whole lifetime, so they could drink unfermented milk as adults too.