@Chizan that is mostly bullshit.... 20 years ago you never hear of people that were lactose intolerant. Heck for example i, my mother and brother used to drink a lot of milk around 400ml per person every day. At that time nature cow milk was cheap as fuck. Something like 1/3 of a today dólar price. We only stoped drinking It because my family past for real bad economy problem when i was around 15yo. Today my brother and mother had lactose problem in my brother is to the point he cant even eat icecream. They problems only started when trash companys like nestle starting the reconstructe milk bullshit.
@Chizan I think you have confused people with cats.
Intolerance and allergies come from avoiding stuff at key developmental points in their lives and when repeated enough times across a few generations becomes more common in children. There was never such a thing as a lactose intolerant dairy farmer because they grew up drinking the stuff fresh and unprocessed. The new sterilisation processes were about being able to preserve milk for longer on shelves and in customers' fridges, so they filtered out various aspects of the milk that would cause it to spoil sooner and in doing so reduced the benefits it provides to the body.
@Temeraire That is because people mostly of European descent have the enzyme that breaks lactose even as adults. For those who aren't they have it as children but lose the ability to break down lactose as adults. The latter case is true for majority of Earth's population(~65–70%). So no, not bullshit.
@DaoFox It has nothing to do with allergies or avoiding stuff, it's simply down to lack of the enzyme that breaks down lactose.
@Temeraire@DaoFox People of European descent ended up developing the mutation that allows them to keep lactase (the enzyme that breaks down lactose) into adulthood since milk was an alternative source of nutrition during the harsh winters. People who didn’t have the mutation starved to death. Other parts of the world didn’t develop this mutation because they were either had other sources of food that drinking milk wasn’t necessary (places near the equator) or didn’t have a lot of access to milk-producing, domesticatable animals in the first place (the Americas). If they did have access to livestock that could be milked, they’d often ferment the milk to break down the majority of the lactase before consumption (like in some parts of Asia). Simply put, the people who are lactose intolerant outnumber those that aren’t.