You may have seen the headlines: some of the biggest names in chicken — including Tyson and Chick-fil-A -- have quietly walked back their "No Antibiotics Ever" commitments. In its place, they’re now using a new label: “No Antibiotics Important to Human Medicine” (NAIHM). That might sound like a small shift, but it carries big implications for how chickens are raised -- and what ends up on your plate.

In the realm of food quality and safety, few topics have garnered as much attention as the use of antibiotics in poultry farming. Notably, Chick-fil-A, a major player in the fast-food sector, has recently re...