Primarily it was fatty parts or ligaments of meat. Basically everything besides lean meat. It did create somewhat of retching reaction. It did reduce over the years and as i can choose what type of meat i eat myself nowadays, it's not as big of an issue.

Biggest issue is generally efficiency. Any food that requires way too much effort to eat isn't really worth it. Like chicken wings, that stuff is primarily bones and ligaments, minimal edible tissue. Completely pointless food. Chicken breast, much better, it's primarily lean meat.

Not only limited to meats. Like oranges, the peeling of those makes those worthless to eat.