Maintaining a good metabolism is an important part of long term weight loss. After a night without eating, your body is in a mild fasting state, as it would be if no food was available. For the entire morning, instead of working at peak rates and burning off more calories, your body will be trying to conserve everything it can. Eating a healthy breakfast will speed up your metabolism and make it work harder.
Have something to eat when you first get up to kick start your metabolism.