I was born into a vegetarian family (for religious reasons) and remained so for for the next 18 years until I went to college. There I was tempted by the flavors of tandoori chicken and took my first bite of meat. No adverse reaction.
I have not developed a taste for meat though and will eat it only when vegetarian choices are very limited and the chicken alternative is more attractive. I still cannot stomach the smell of fish or any seafood. My digestive system does not rebel whenever I eat meat. I have a number of friends and family members who are exactly like me and have not heard of any problems.
I was a vegetarian for the first 21 years of my life. Just couldn’t bring myself to eat the stuff. I used to eat eggs rarely, but that was about it. After that I moved to Japan…
Initially I couldn’t bring myself to eat any Japanese food. After a few months though, I was pretty much sick of making my own food and decided to take the only sensible course left. First I started off with eating chicken and other “easy” stuff. It didn’t seem tasty at first, but then I got used to it in a few weeks. Then moved on to burgers and such, no problems. After that, I rapidly progressed through almost all imaginable types of meat known to mankind (Probably I was trying to prove a point to myself, I am stupid that way).
Some of the wilder examples:
Some cricket like insects in Thailand - crunchy and spicy.
Also tried Balut(duck embryo) without throwing up as I had expected. - little yucky but not too bad.
Rice crackers with wasps embedded in them - extremely good.
Fresh raw octopus - strong smell but pleasant taste like hard gum.
It wasn’t such a big deal to become a meat-eater, once I got past my initial queasiness. The toughest part was getting past the smell and the chewy textures.
When I go home for the holidays(for around 3 weeks a year), I don’t eat meat and don’t miss it, and when I get back, I switch to eating meat without any problems. Never had any problems.