OK, along this line of thinking......
Are there any foods/greens/fruits that I SHOULDN'T feed my chicks and hens? (Other than meats, of course)
Lots of misconceptions around. A) meat is fine, they're omnivores, animal protein is good for them. B) the only thing I can think of that might normally pop up is raw potato skin (the greener it is the more dangerous in this case). There is a compound in the skin that can cause serious issues. But even that's not a sure thing. C) everything else is fine in reasonable doses.
Of course the standard disclaimer I always feel required to say "I have to recommend a good balanced diet with treats not to exceed 10% of the diet as that risks unbalancing it and could potentially cause long term health issues if done over an extended period of time."