Lactose intolerant…but butter and heavy cream?

In preparation for some birthday cupcakes, my friend asked me if the recipe would have any dairy (as her daughter is lactose-intolerant). She mentioned that her daughter can tolerate butter, but not “milk.” In my scientifically-curious mind, I had to set about understanding why that might be! And truth-beknown, sure enough…the lactose is in the “watery” part of the milk, and very little in the cream. There is still some, but it explained to my mind why someone could handle butter, but not milk.

 

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