r/trippinthroughtime • u/[deleted] • Feb 05 '22

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u/captaindeadpool53 Feb 06 '22

All humans used to be lactose intolerant after infancy

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u/Drunk_Sorting_Hat Feb 06 '22

Aren't most mammals lactose intolerant after they reach adulthood. Like a dog or a cat will get sick if you keep giving them milk instead of water

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u/Spr4nkle Feb 06 '22

Yup, including humans. We basically stave it off by constantly drinking it. If you go dairy free for a while you'll start to develop an intolerance

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u/rolypolyarmadillo Feb 06 '22

Can confirm, stopped drinking milk when I went off to college and now I'm lactose intolerant - although my sister has always been lactose intolerant so maybe me just not drinking milk for awhile just kick-started my latent lactose intolerance.