eat bigger breakfasts. that usually does it to shut down the big hunger pangs later in the day which happens because your blood sugar is dipping.
other than that, eat more whole grains, less simple and refined carbs. more fiber - fruits and veggies too. this will again help release glucose slowly into your blood stream from your intestines, rather than go into a sugar high followed by a crash and hunger pangs.
include sufficient quantities of protein, and healthy fats in your meals, else you will not feel full.
read this CE.