Trying to find scholarly articles showing health effects of eating factory farmed meats.

I recently read "Eating Animals" by Jonathan Safran Foer and it's had a bit of an impact on me. There is lots of hype and language about how factory farmed meat is terrible for you, but I am having trouble finding solid articles to back it up. Help me find facts not fluff.

Background: I've been a meat eater my whole life (mid 20's now). I eat a toasted deli-meat sandwich every day for lunch and often have some type of meat with dinner.

Trial: Eat vegetarian. I intend to do this during the next month while I find more information explicitly and thoroughly documenting physiological ramification of eating factory farmed meat.

Need:

-An article that breaks down what chemicals/molecules are found in factory farmed meats (pre and post cooking).

---Any article talking about the effects of consuming "x" thing in "y" quantity.

-A well controlled longitudinal study of the effects of eating factory farmed meats.

---Also interested in any study showing short term effects.