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Pretty good! My only recommendation is that you consider including one or two academic journal sources.
-Sadie

I agree with Sadie.  Some more academic sources would give your argument the ehtos it needs to be taken seriously.  Including some more scientific sources or studies could really help to support your argument beyond what you currently have. 

Based on the information you've acquired, I think that your argument for vegetarianism could be a very strong one.  If I were in your position and writing this paper, I would start my argument with first explaining what being a vegetarian is, and what it isn't.  This would remove any doubt or suspicions the reader may have.  After this I'd explain why this topic is important for anyone trying to live a health live and then perhaps you could make suggestions for ways to transfer to a vegetarian lifestyle?  Overall, I think you've found useful information in making an argument for why vegetarianism is the more health diet choice for anyone trying to live a long and healthy life.

Don't forget, there are always those who will oppose the argument and you should consider ways to counterargue what they say.
-Adrian