I am a big fan of the Ideological Turing Test, and applying it to different domains, and I was happy to participate in this one. However, I wonder whether this is an appropriate domain.

I think the ITT works best when there are coherent and well-defined opposing positions, of roughly equal size and intensity. The abortion debate is a good example - while there are differences in emphasis and gradations of support, it is clear what the two sides are. Other good examples are the minimum wage debate, the global warming debate, and the debate. The ITT works worst when the positions are incoherent and ill-defined, or of grossly unequal size and intensity. "Was Tony Blair a good Prime Minister?" is a good example - it's not clear what it means to be a good Prime Minister, there are people who (dis)approve of him for diametrically opposite reasons, and his detractors are much more invested in the question than are his defenders.

Sadly, vegetarianism is much more like the latter than the former. Some people are vegetarians for health reasons, others for animal welfare reasons. Vegetarians typically feel strongly about the issue; non-vegetarians simply don't care about it, and have typically not considered the issue nearly as strongly. There is no "opposing side" to vegetarianism that would drive the ITT; all that links non-vegetarians is that they don't find vegetarian arguments compelling.