I drink protein shakes nonstop - three or four a day - and I run a lot, so you get rid of the bad carbs and keep the rest so you have the energy to make it through. ↗
I don't really want to be fat, so I stop before I am. I'm not a vegetarian, but I might go through a phase when I'm not interested in eating protein for a week or so, and then I might go through a phase when I eat nothing but steak. ↗