You have this backwards to the point I thought you were being sarcastic. Cows and pigs require a huge multiplier of agriculture (and water) to feed them in order to produce an equivalent amount of food for humans.

Thanks to subsidies targeting livestock feed, it is cheaper to buy feed shipped from the next state over than it is to grow it yourself. Thus, petroleum based fertilizer, transportation fuel, and dung reservoirs.

Then there’s the whole issue of methane from cow farts being a serious source of greenhouse effects. It would be funny if only it wasn’t.

And, the obesity/diabetes link is also tied to farm subsidies making starchy corn and wheat practically free while leaving actually healthy vegetables to compete against practically free.

The only way out is to ramp farm subsidies down to zero. That would be political suicide because it will increase the price of food. Especially meat. But, the alternative is to continue to slowly eat our way into diabetes and global warming.