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In this case that food is probably not cows milk, typically being pasteurized before being sold. This is not a debate about macronutrition, it's a debate about the particular distributions of guy bacteria in different people

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I dont think the commenter is saying that they are lacking the bacteria. If they have a bacteria that feeds on lactose / milk, and they give pasteurized milk, ,it will promote growth of that bacteria.

Only if they dont have the bacteria at all would pasteurized made a difference.

But it's not even clear that the bacteria feeds on the milk. There could be other mechanisms of action for preventing or suppressing allergy.

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