Perhaps it's your body telling you for some reason it doesn't need meat right now. Like an instinct. Maybe you could try eating less meat, so you'll look forward to it.
I like chocolate but if you eat too much everyday you won't enjoy it so much anymore.
I too think it's reasonable to eat less meat for ethical reasons. I'm not a vegan or vegetarian, but I think it would be great if everyone decreased their meat consumption a little. We don't have to be extreme vegans or extreme meat eaters. Maybe this is what your body is telling you, too.

Maybe you're different, but when I eat too much meat my body gives me signals of "disgusting" too. Then I eat vegetarian meals for a week or two. After that, my body asks for meat again. It's probably natural and we're lucky we haven't lost our natural signs of satiety in this artificial lifestyle that we live.

BTW I fully respect vegans and admire them in a way. So this is not meant to be against their ethics at all. If I had a vegan friend I'd be happy to cook for them if they came to my party. I also like fruit, vegetables and nuts :-)