I probably went a full month without eating any land-animal meat, and only had fish when eating meat. I tried being a pescatarian (I still don't know how to spell it), and it was pretty tough. I had a dream about eating a steak, and I decided that was enough.
I don't have a huge problem with eating beef, from an animal well-being point of view. Cattle get to be outside, graze, and walk around. They at least have a halfway decent life before being slaughtered. Chickens and hogs do not have quality lives.
I'm still not going to eat pork or chicken, but I am going to eat beef. I wasn't eating much due to animal well-being problems and environmental problems. I think in the next 100 years we'll be eating synthetic meat, and both of these problems will be eliminated. Until then, I'll do what I can.