I googled a bit more:
Quote:
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Originally Posted by Colin Campbell
But importantly, we also had evidence that this effect was reserved for a dietary level of casein that is above a threshold required to meet the rat’s needs for protein, i.e., 10-12% of total calories. We also obtained evidence that this is true for casein but not for wheat protein or for soy protein, even when these latter proteins are fed at 20% of total calories. However, the fact that this casein effect exists above 10-12% on up to 20% or so makes these findings very relevant, in large part because humans and rats have about the same requirement for protein and in part because the range of human consumption for protein is about 11-22% protein, well within the range of this effect.
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Even if this is true, it doesn't seem like a very strong finding. 10% of calories in an adult male would be 60g of casein or over 2 quarts of cow's milk. I don't think very many people drink that much. Apparently there are some people who believe casein free diets can improve autism, and some people are allergic to it. There is also a strain of probiotics, lactobacillus casei, that help humans break down casein.
Maybe I am not seeing the whole picture yet, but so far it seems to me to be a long way from this study to 'you shouldn't drink milk' let alone 'you shouldn't eat meat'.