I'm on the opposite camp and think Fed Up is not a good movie to watch and seems the author (Kuric I think) had a bone to grind mostly with the fast food and shitty food industry.

I remember a scene about a mother going to the store, and buying 'light' oreos/chips/other stuff, and giving that to their kids instead of the regular ones to their kids and then complaining he didn't lose weight and taking as a conclusion that 'dieting' and 'exercise' doesn't really work. Never considered that maybe a carrot stick or an apple would be better, she would just buy diet soda/cookies/chips.