Since you asked...
1. Health: regular meat eaters die an average of 12 years earlier than veg's. Occurrence of cancers and a myriad of other diseases are significantly higher in our omniverous counterparts. When I made Dylan eat vegetarian for a summer, he lost 20 lbs without any other lifestyle changes. And he commented that he felt better after eating - not heavy and weighed down.
2. Chemicals: meat and dairy today are filled with so many toxins and treated in such an unsanitary fashion. My friend Clint sent me this site: www.themeatrix.com and I found it interesting. There are a lot of shady practices going on in the food industry. Buy local, buy organic - meat, dairy, veggies, anything!
3. Peace of mind. After unearthing the main course at Joe's Pig Roast, my 5 year old daughter came to me sobbing, "Pigs are one of God's creatures!" I've decided not to eat anything that I wouldn't kill with my own bare hands. I'll pick a tomatoe, slice an apple, grill a zucchini. But a cow? Honestly, a cow!? I can't imagine. (Side story: as a young lass, our neighbor the old farmer asked if my brothers and I wanted to come help with the chickens. I imagined picking up a fluffy baby chick, giving it a little kiss, and moving it to nice open feeding grounds. When we arrived, he was stomping on chickens heads and twisting their bodies off. I cried. )
4. Personal Mormon Interpretation. D&C 89:12-13 "Yea, flesh also of beasts and of the fowls of the air, I, the Lord, have ordained for the use of man with thanksgiving; nevertheless they are to be used sparingly;And it is pleasing unto me that they should not be used, only in times of winter, or of cold, or famine."
To me, "sparingly" is not twice a day, as is the normal American diet. Most interesting to me is verse 13, about God being pleased that they not be used, and only in times of winter, cold, famine. I've not experienced a famine, and in our day and age, produce can be acquired year-round. Do I need to shoot a bunny with an arrow to survive the winter? I'll stick to my vegetarian lasagna and cuddle by the fire.
So, those are the top 4. There are more, but, eh. I'm not the kind of person that's going to throw red paint on guests at a pig roast. I even occasionally make a meat dish for my dear hubby, who is good enough to eat nearly anything put on his plate. Please don't get offensive and write mean things about how you're a meat eater and still a decent human being and I'm full of baloney (I'm literally not - at all). Some people have just asked.

YAE!
I love reading what you have to write, and it has been sooo long since you posted!
Welcome back! haha
I read 'The Omnivore's Dilemma' by Michael Pollan a few months ago. It was very entertaining and educational. http://www.michaelpollan.com/omnivore_excerpt.pdf