I don't know if this is sarcasm, but the answer is wholeheartedly the meat and dairy industry.
Every major organization/gov wants to make people eat more veggies and less meat
Most people these days de-facto have a high-carb, high-meat diet. Conversely it's perfectly possible to have a low-meat, low-carb diet (I'm currently doing a vegetarian keto). To me it sounds just like yet another excuse to dunk on the silly hippy vegoonz.
Industrial agriculture benefits a lot from animal farming given that 67% of crops are sold as livestock feed.
Or is there a secret society of leek producers controlling the world?
Name one vegetable producer that makes the kind of profit that meat and feedstock producers do.