If you're just not hungry and can't force yourself to eat breakfast, you should at least try to drink some juice. That way, you're getting a healthy dose of nutrients, as well as the glucose your body and brain need to sustain themselves until lunch.
If you're on a diet, you may think that it's a good idea to skip breakfast in order to lose weight -- but that's not necessarily so. According to studies, most people who skip breakfast end up eating more later in the day, often sabotaging themselves by choosing more calorie-rich foods.