Because I needed to lose weight, I changed my diet to eat a lot more vegetables (and
re-kindled my interest in cooking, to make it more interesting).
Then I also read
In Defense of Food, the most sensible book on food and eating I have read in a long time, and I have started to focus much more on the quality of what I eat.
I find that I feel less and less like eating meat, mainly because 1) vegetables are more interesting and varied to cook, and 2) it is
much easier to find good quality vegetables than quality meat. And I will not eat low quality food if I can in any way avoid it.
I've just come home from holiday on Iceland, where I had some particularly nice lamb and horse meat. It is really difficult to find anything remotely as good here, especially in single-sized portions. The easy and lazy thing to do is to eat less meat. I like vegetables anyway, and they're fun to cook.
The only moral part of the issue for me, is that meat production is more energy-intensive than vegetables, and I find it right to be a little prudent with my energy consumption.