Hacker News Reader

National:

McDonalds: "Yes, every patty is 100% real beef with no fillers, additives or preservatives." Burger King: "Our beef patties are made with 100% beef with no fillers, no preservatives, no additives, no nonsense." Wendy's: "100% pure beef across the menu"

Regional:

Carls Jr: "100% Pure Ground Beef." Sonic: "100% pure beef patty" Jack in the Box: "100 percent beef"

Funnily enough, it's the more expensive casual restaurant chain burgers that tend to contain textured soy protein and other things. Fast food is pretty much always 100% beef as others have pointed out.

I've definitely noticed this as someone allergic to soy protein. The big fast-food chains are generally safe. It's fast casual, local diners, and that kind of thing that's the problem for me.

Source? The fast food restaurants I can think of all claim 100% beef patties.

Also cheap dog-food is mostly vegetables or fillers, but that fact never seems to be brought up when vegetarian dogs are discussed.