Yes, breakfast is very important while dieting. Studies show that people who skip breakfast actually gain weight than those who eat breakfast.
Not only that, often eating in the morning will help you to concentrate better. The reason you dont feel hungry until dinner when you dont eat is probably because your body got used to absorning all the calories at dinner-time. This is also what contributes to wieght gain.
Try eating a low-fat, low-calorie, high protein breakfast and have a small healthy snack when you feel hungry at 10.
Hope this helps, take care.