Becoming Intolerant to Foods

[DEADlifter]

Update:

Lactose free shakes won't help if you eat a whole can of cream of mushroom that contains both heavy cream and whey protein concentrate. Lol

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[Koalocelot]

Yes, I became lactose intolerant out of nowhere about 4 years ago.
If I drink regular milk it totally jacks my stomach up.
However, I can eat cheese and can still use protein powder. Shits wierd.

It sounds like, as you said, the problem was lactose itself. There are very low amounts in most dairy and protein powders so most lactose intolerant people can still handle them. Some guys are allergic or intolerant to the milk proteins themselves, and these guys would have a much harder time with cheese or protein powder.