eli5 Why does milk go bad?

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What happens to the milk that makes it give us problems when we drink it?

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Milk is full of things that help living things grow, which is why it’s so good for infants. It has nutrients, fats, sugars, and protein all in one place. What makes it so good for infants also makes it good for other living things, like bacteria. If bacteria gets in, then it starts to slowly eat away at the milk while pooping out waste that makes us sick.