The fanatics are emaciated. The fanatics pick at a few nuts and berries. These leaf-lovers may know something. The leaf-lovers are fastidious. Most steak-lovers don't want to know it.
Populations continue to grow.
Available land dwindles. The dwindling is rapid. As these occur, there will be less and less food for the world's hungry mouths. We should shift to basically vegetarian diets. Vegetarian diets encourage wiser use of our land.