Junk food and behavioral changes? Is there a connection? Tiredness, boredom, and anger can result in poor behavior. It is the same for children as well. However, there is one more reason that can lead to bad behavior among children. The type of food that children eat can also contribute to their inability to behave appropriately. Junk food is considered as the culprit and restricting its intake is a potential way to cut down on specific types of behavior.