Originally Posted by Silock
Protein will spike insulin, too. Especially whey. You won't be able to stay in ketosis all day, anyway. But protein will not keep you out of it for as long as other foods would.
Yeah whey will, but obviously not as much as a high carb meal. The bulk of calories on keto need to come from fat anyway, so whey shouldn't even be on the menu. Fatty steaks with blue cheese crumbles FTW.