Find a good hometown grocery store and buy your stuff there.

Jim Hightower | WHAT COLOR IS YOUR STEAK?:

Tyson, Wal-Mart, and other food giants have been gassing their pre-cut packaged meats with carbon monoxide, which turns a steak puckishly pink. This makes weeks-old meat appear to be as fresh as the day it was cut. But, wait – we've been taught that the clearest indicator of freshness is the meat's color: Pink, good. Brown, bad. It's raw consumer deception to let industry pass off old meat as pink and fresh.

(Don't read this right before dinner, would be my advice.)