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Removing the ability to drink milk also comes at a cost. You body has to have the program to remove lactase production exactly when appropriate else you die or

• thaumasiotes 6y ago
  > Don't you find that surprising? Why drink milk if it does nothing for you? You can view milk as a mixture of four basic nutrients: water, fat, protein, and sugar. What we're discussing here is the sugar. No one anywhere has problems digesting the protein or fat. So the answer to your question is, because milk is quite nutritious even ignoring the value of the sugar. Lactose-intolerant populations today frequently consume yoghurt, cheese, and even milk for this reason. Yoghurt and cheese contain negligible lactose. (A fun way to think about this is: take out the sugar from the milk and you get yoghurt. Take out the water from that and you have cheese. Take out the protein from that and you have butter. Of course, that's not really how these things are made; you get butter by separating the fat from milk. But still.) Metabolizing the lactose in milk gives you more than you were already getting, but you were already getting plenty.