Reading this report in Science Daily today it occured to me that it is not really clear what is meant by red meat. Is it the meat of mammals, or is it specifically the meat of farmed mammals? The meats normally referenced in experiments are generally farmed cattle and pigs. What about sheep meat; presumably lamb and mutton are red meat? Does the dark red meat of some poultry, such as duck or goose, or the meat of game birds such as pheasant or grouse count as red? What about wild game animals such as deer; is it being mammal meat that matters or something to do with whatever it is that makes meat dark. How about alligator or frog or lizard?
Has it been defined or is it just sloppy useage?