Actually, the studies that showed how important it was to eat breakfast are now being challenged, and with success. Not only were they poorly done, and done many years ago, new studies are showing the opposite. The idea of jump starting your metabolism with calories (in oppose to physical activity) is pretty silly. Even the idea of metabolism is something we don't really understand. That's why the idea of small meals every 3 hours is laughable, because no matter how many calories you eat in one sitting you're going to use 10% of them for digestion, whether those 2500 calories come all at once or in a bunch of small meals throughout the day.