My decision to stop eating meat was a long and gradual process over a period of about 5 years. Different meats started grossing me out until I was only able to eat organic free run chicken and turkey. It was a texture thing for the most part... grissle, fat, bones... Ugh... Not good. Then at Thanksgiving dinner 2008 I decided that was going to be my last meat, and I haven't touched it since.
I'm an octo vegetarian, I don't eat dairy (currently on an 8 month cleanse and may or may not resume eating dairy at some point... but only organic local sources if I do) or soy (allergies). Eggs gross me out too, but I find I really need the protein in the mornings or I'm famished and grumpy all day. Protein drinks just don't cut it. :/ I try not to look at them while they are cooking, but once they are cooked I'm fine...

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Interestingly, after becoming vegetarian, I started seeing more animal cruelty cases in my own neighborhood. The worst was seeing hundreds of live chickens being shipped from a chicken farm in tiny cases stacked on top of each other, pooping all over each other. The stench was so intense I dry heaved when I drove by. Very sad...
As for the health aspect, I haven't really noticed any difference there.