Chickens will eat most anything but you should not feed them things that have spoiled. I don't know about other people's chickens but if I offered mine only fruit rinds they would stand there and laugh at me. I do give them fruit that is slightly overripe - bananas are a favorite (of my girls). Grasss clippings are fine and so is cabbage, lettuce, kale, broccoli, etc. About the only vegetable mine won't eat is carrots - not cooked, raw, grated, sliced, purreed - just not at all. While they will eat (devour) french fries, you should not feed them raw potatoes or potato peels. Be certain that they are getting the majority of their diet from a properly formulated feed -- starter, maintenance or layer according to their age and needs. Even when fed an optimal diet as mentioned they will still appreciate all the treats you have to offer. Many people give their chickens leftovers and when I fix spaghetti, I allways cook some extra noodles for the girls - just because it is such fun to watch them play chicken keep away with the noodles. I also raise earthworms and give them a few a couple of times a week. When they see me get the shovel, they all come running. Apparently, I'm easily amused.