There’s someone doing good research on this now which is not yet completed, but I bet if you scratch the surface the HAES and Fat Acceptance movement receives large amounts of funding from the US processed food industry. And:

I will be absolutely shocked if the FA/HAES movement is not mostly funded by food interests. I think there is about a 100% chance of that being the case. Otherwise it makes no sense as a cultural phenomenon.

(Yes, GSElevator seems like a real tool. Which is why I didn’t link directly to his Twitter feed. But being an asshole doesn’t make someone wrong.)