What are some criticisms of the "Food Babe" and why is she considered controversial?
The "Food Babe" is controversial for one reason, and one reason only - she's a moron who will say anything, regardless of how ridiculously wrong it is - to sell her products.  For example, this is a woman who once said that air on commercial planes is bad for you to breathe because airlines "pump in" 50% nitrogen (which she implied was too much) in the air, which she claimed caused all sorts of bad effects.  Nevermind that the air we breathe at sea level is made up mostly of nitrogen.  She's a scientific moron.  That's why she's controversial.  She's an idiot and a liar.  Her name would more accurately be "Food Idiot."