Chickens can't taste much of anything. According to the Cornell Hanbook of Bird Biology, chickens have 24 (count 'em) tastebuds. By way of comparison, humans have over 10,000 taste buds.
I think chickens learn and remember things they've eaten before. My flock will go for the swiss chard before they'll go for strawberries or a canteloupe rind, because greens are a daily treat and fruit an occasional one. One day I brought in a honeydew melon rind and the chickens all ran away from it in terror. But when I put it in a dish that I feed them treats in, several of the braver ones ventured a peck or two, and then the whole flock piled on.
Simply as a matter of nutrition, I don't think you would want to feed chickens processed foods high in sugar since those are also likely to be low in valuable nutrients. Salt is another thing to watch out for, since birds generally don't excrete it efficiently.
I think chickens learn and remember things they've eaten before. My flock will go for the swiss chard before they'll go for strawberries or a canteloupe rind, because greens are a daily treat and fruit an occasional one. One day I brought in a honeydew melon rind and the chickens all ran away from it in terror. But when I put it in a dish that I feed them treats in, several of the braver ones ventured a peck or two, and then the whole flock piled on.
Simply as a matter of nutrition, I don't think you would want to feed chickens processed foods high in sugar since those are also likely to be low in valuable nutrients. Salt is another thing to watch out for, since birds generally don't excrete it efficiently.