My chickens are healthy birds and lay almost eggs every single day. I give them treats like mealworms and make them salads every day. I dont think its effecting their health at all.
My girls come up to the front of the coop when they see me. I like to bring them stale bread or leftovers, also watermelon rinds are a treat. They know that I am the one who feeds them these things so they watch for me and see if I come outside.