I gave up eating meat in late 2009, not for any moral or ethical reason, but because it just started to gross me out.  I guess my decision to stop eating meat was more for health reasons than anything.  The more I read about veganism, the more I began to believe that the human body is not designed to digest animal protein.  Not only that, but learning about all of the hormones and antibiotics animals are fed made me give it up cold-turkey (no pun intended).  I would still eat the occasional piece of fish or raw goat cheese, but I considered myself “vegan-ish.”  I really thrived off a plant-based diet.  Because animal protein is much harder to digest, I had all that extra digestive energy to use.