> I think the actual genetic factors for lactose intolerance are very rare. It probably has more to do with gut flora and consumption. Not really, lactose is b

> I think the actual genetic factors for lactose intolerance are very rare. It probably has more to do with gut flora and consumption. Not really, lactose is basically converted straight into glucose by lactase, and if you don't produce lactase the lactose is going to be digested by a variety of bacteria and turned into a whole host of products (some of them usable by the body) but mostly gas. There isn't really a way to avoid that, even though gut flora can be more or less efficient and allow non-lactase-producers to mostly digest milk, it's never as efficient as using lactase. > I think all people develop an intolerance with age naturally No, it's a well-researched thing, some populations of humans keep producing lactase after their childhood and some don't. It's not related to the milk consumption of an individual, either.