@platorepublic,
the only people who need to study what to eat in the way of non veg food are those brought up in a society where meat is the staple. here in india nobody knows anything about nutrition but they dont suffer from any deficiencies as a result of being vegetarian. and in fact they would not have the enzymes necessary to even digest meat if they were given it. apparently human beings are able to subsist either way, which makes us able to populate a larger portion of the globe.
in america when i first became a vegetarian i studied up on how to have a balanced diet, but it isnt really that complicated once you learn how to cook things properly-to my taste that means using lots of spices and hot peppers. no wonder no one in america likes vegetables since no one knows how to cook them. and the idea of what vegetarians eat in america is really crazy...diets made up by people who want to feel and believe they are still eating meat. no one here knows what tofu is, believe me...
food supplements are risky...
so what people choose to eat is basically what they are used to-and to get used to something totally different is not easy, except for a select few that were never doing well on what they were used to. proper nutrition is easily available either way, so basically i conclude that it is neither better or worse for human beings to be vegetarians or meat-eaters-it is only better or worse for the animals and the vegetables.