This can't be truth. The most parts of an animal are muscle and fat, organs and cartilage are the minority part. Organs are the minority part. I don't think those people could afford to waste parts of an animal, most of the animal in fact.Ray Peat did say in ancient cultures the muscle meats were given to the dogs. It sure made me change my perspective on meat. The iron and phosphorus in it is even more reason to lean into better options, like liver eggs for me too.