If you cut the highly processed carbs (sugar and wheat based snack foods primarily) from your diet, you will stop having the 2-3 hour cycles of hunger, energy rush, crash, and food cravings. Once your body has corrected itself, you will no longer need to eat for "high short term energy". Think about human history for a minute and consider whether it would be an advantage for hunter-gatherers to have to stop and eat every couple hours. The fact that everyone generally does now and that people living on traditional diets like the Masai of Africa do not should tell you something.

While it is an aside, getting enough sleep will also reduce your necessary daily food requirements by about 400 calories.