how come a lot of people are lactose intolerant if everyone started off by drinking milk as a baby?
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Lactose is about 4-5% of cow milk and about 7% of human milk. It is possible for infants to be lactose intolerant and it causes all sorts of gastric issues for the infant.
As we age, the amount of the enzyme lactase (which breaks down lactose,) we produce tends to decrease with age and if stop consuming milk it happens more rapidly.
People who are lactose intolerant can consume it but suffer from gastric symptoms. So people who are intolerant can consume small quantities without ill effects but at larger quantities get horrible symptoms.
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