A well-fed world is a vegetarian world
Samuel Fromartz doesn't like genetically modified food, but not for the reasons you think. We don't need more food, he argues in the Atlantic, but better access to food — there's actually plenty of food in the world for everyone to have enough, but most people can't get at it. GMOs don't do anything to improve that situation, they just make more of things — and what they make more of, specifically, is meat, since most GMO crops go to animal feed. That's the least efficient way to feed the world, says Fromartz: Meat is an inefficient source of calories, and it tends to be available mostly to people who can already afford food.
What's a better solution? Fromartz suggests we increase incomes — good luck with that! — and "incentivize less resource-intensive food consumption," which means reducing (though not eliminating) the eating of meat.
How to Feed the World By 2050: Biotech Isn't the Answer, The Atlantic.