In a moment of honesty I will admit I don't have strong evidence against the null hypothesis that my dislike of veganism and related is primarily due to their association with radical green movement, and New Age style fringe, both which I strongly dislike for quite rational reasons.
I can obviously say "meet is healthy", "humans are omnivores", and the ever popular "think of the children" (by the way if you haven't read Eliezer's Three World Collide, do it now, it's awesome) - but I think they're all rationalizations for my dislike I developed after being exposed to too many meat-avoiding freaks, and not primary reasons.
I appreciate this admission, almost as much as your many excellent comments on LW. I also have strong disagreements, though seemingly less emotional ones, with the radical green movement and New Age style fringe.
I have noticed that among philosophers, vegetarianism of one form or another is quite common. In fact, I became a vegetarian (technically a pescetarian) myself partly out of respect for an undergraduate philosophy professor. I am interested in finding out if there is a similar disproportion in the Less Wrong community.
I didn't request that this go into Yvain's survey because I want more information than just what animal products you do or don't eat; I'd also like to see nuances of the reasons behind your diet. There are a lot more shades than carnivore/vegetarian/vegan - if you want to be a vegetarian but are allergic to soy and gluten, that's a compelling reason to diversify protein sources, for instance. I'd also like to hear about if you avoid any plant foods (if you think they're farmed in a way that's environmentally destructive or that hurts people or if you have warm fuzzy feelings for plants, maybe). Here are some questions that come to mind: