So when I mix whey protein isolate into pineapple juice with plain Greek yogurt, is that considered an ultra-processed food? It seems like it would be, but I doubt the criticisms of UPFs really apply here. My understanding is that these are healthy ingredients, in a blend that's fairly optimal for strength training, despite one of them being highly processed.

Is there actually anything wrong with whey protein? Or can we find a better definition of the problematic UPFs?