BCD

I haven't heard of even a single religion which tells humans to kill and eat other animals, let alone to eat a list of animals and spare another list of animals. Yes, I really need to research and find such a religion then, any help please?
 
Talking about the reverse case first... The huge population of humans on earth become carnivores. Eat all types of animals they see, the poor animals become extinct. Lions, Tigers, die due to lack of food since we are eating all of theirs. 
You see its not as simple as that, humans generally don't eat the food of cows-->grass, horse->grass etc. All these animals get their food from nature. Humans eat farmed food, so is the case with animals too which are mostly farmed. BUT WAIT, what do these farmed animals (cows, goats) eat? The hard grown plants grown in farms. So, grow plants and make animals eat them and then humans eat these animals. So who is depleting resources faster, vegetarians or Non - Vegetarians? Moreover there is a forced increase in animal population due to farming of these animals which causes an imbalance in nature and aid to global warming.
 
Lastly, my last example was not my claim actually, the 'I' in those statements is a placeholder to whoever wants to reflect those statements on themselves, instead of addressing as 'you'. I was bringing up the fact that when someone kills humans they are punished, but why not when someone kills an animal, when both humans and other animals fall into the category of animals. And when it is the law of nature to eat other animals, then why humans are punished to kill other human beings?
 
Lastly, if a single amino acid can make me malnutritioned for whole of my life against hundreds of odds of non-vegetarian diet then obviously I better die as vegetarian. (Anyway, I am strong, vegetarian, and healthy and athletic with no risks of heart disease) At the minimum I do not carry the curses and sins of killing hundreds of animals in other case.
Anyway, by eating a variety of vegetables one can get all amino acids needed for human body. http://www.madsci.org/posts/archives/2001-03/984769959.Bc.r.html I like the idea of eating a dozen different plants to get my proteins than eating a single source (meat), spoiling my appetite and soaring my risk lists and sins list. So now I have my amino acids as vegetarian, coming to last part:
Effects of things... you mean effects of eating veg and non-veg. I hope the above point clarifies the thing, if not I can bring upon a table clearly listing the effects of vegetarian diet and non vegetarian diet in my free time.