Source for the claim McDonalds buys eyeballs. Eyeballs are very tough and chewy. I suppose if used as a lower percentage filler in ground beef people wouldn't n

Source for the claim McDonalds buys eyeballs. Eyeballs are very tough and chewy. I suppose if used as a lower percentage filler in ground beef people wouldn't notice much, but I highly doubt a significant fraction of burger meat is eyeball.