I read somewhere that taking protein powder could potentially cause problems internally with your body in the cancer arena. The reason...is that protein is used within your body to produce cancer growth if it starts to happen. Not sure if that is true but I am certain it is something that I read somewhere. Just asking?
Edit: If you search, I'm sure you can find articles like this one but then again there's always the flip side of the coin (better paper as well). I'd say enjoy your protein