hmm..... not at all, mostly because i've never seen much of a point in it. heck, part of the reason why humans started eating meat in the first place was because it was biologically advantageous for them to do so. nutritional value? yes. much higher quality than most alternatives? very much so.
honestly, i don't think there is any reason not to, as plants are just as alive as animals anyhow. (those animal rights activists are so ridiculous, as humans are the only ones that actually ever have the capability to be "humane", as even wolves beat the crap out thier food before actually eating it. it's just natures way, so much so that actually being humane is unnatural.)
then you have the fact that it has been proven that plants can and do feel pain (well they do have a type of nervous system afterall, so it should be obvious) yet appearently they have no problem with skewering carrots for dinner when they also say that it is morally wrong to do the same to a cow, just because a cow has a face. so who's the real ridiculous one here eh? *hypocrits*