Going vegetarian made me seem like a much less picky eater. I only really liked the "bad" meats -- pepperoni, salami, beef, venison, lamb, etc. I lost the ability to digest red meat in my mid-20s, and all meat in my early 30s. I still love when people barbecue or eat fragrant meat around me, though.

I'm not even tempted to take a bite because it's poison to my body. (Not to everyone's bodies; if you can eat meat, I envy you!)
After a lot of misdiagnoses and running around in circles, I diagnosed myself as lacking in digestive enzymes. My always-problematic stomach has gotten much better since I stopped eating meat, most raw vegetables (carrots are an exception), and started religiously taking digestive enzymes. I have to really limit fried foods as well. If I forget to take my enzymes for three days, my stomach is back to its usual cranky self and takes a week to get straightened out.
I'm not lactose intolerant, so the allergy tests say, but any milk above skim milk makes me sick within an hour. (I usually drink almond milk, but can substitute skim without fear of getting sick.) With cream-based sauces, e.g., alfredo, I won't even make it an hour. Oddly, I can eat products made with full-fat milk, e.g., cheese (within moderation) or yoghurt, just fine. No need to even take a pill. Haven't quite figured this one out, but I'm not complaining.
Top three things I can eat, but can't stand:
1) Diet Coke -- for me, this was a terrible addiction that took years and 6-7 tries to stop. The withdrawal was terrible. As soon as I was "clean" for a while, I couldn't believe I ever drank it. It tastes like cleaning fluid. May God strike me down if I ever take another sip!
2) Olives -- whatever was in my Mediterranean relatives' genes skipped me. Someone once offered me a martini that I didn't realize was dirty, and I spit it clear across the room.
3) Chamomile tea. Blech, tastes like I'm drinking a flower!
I had escargot before I went vegetarian, and it was actually kind of delicious even as someone who never really ate seafood when I did eat meat.