Green meat in chicken can look alarming. You open a fresh package expecting pale pink meat, only to discover a green, gray-green, or yellow-green section hidden inside a breast or tenderloin. Naturally, the first question is whether something has gone badly wrong.
Fortunately, green meat in chicken does not always mean ordinary spoilage. One recognized cause is deep pectoral myopathy, also called green muscle disease or ischemic myopathy. This condition affects breast muscle tissue after its blood supply becomes restricted. As the damaged tissue changes, it can develop a surprisingly