When it comes to exercising, there are two kinds of people in the world: those who work out in the morning and those who don't. No matter which one of the two you are, what you do in the morning can help or hurt your metabolism.
For those of you that prefer to leave your workout for a later time of day, eat breakfast almost as soon as you wake up.
If you're going to work out within an hour of waking up, then don't eat. Just make sure that if you aren't working out within an hour of waking that you do put something in your stomach. If you do need fuel before a workout, try a small protein shake or a small bowl of oatmeal. Just make sure it's SMALL. If you can manage to go without, you'll burn off what's in stores from the day before as opposed to just burning off what you ate for breakfast.
The important thing to remember is: your workout or eating a healthy breakfast is going to jumpstart your metabolism.