There are advantages to eating vegetarian. 35% of the world's grain production is now fed to livestock instead of people.
Americans consue twice as much meat as the Chinese. Yet, China now raises half the world's pigs. China now has to import grain to feed all the pigs. All that is grain that cannot be fed to people who use grain as the staple in their diet, and likely cannot afford meat.
There are 35 million starving people in the world.