I'm still 2 stone over where I shoudl be, so not exactly a poster child for weight loss, so take this with a big pinch of condiment, but...
what I learned from the 'primal blueprint' is if you swap n calories worth of carbs with the same of protein or [shockingly] fat, you wont feel as hungry as quickly. Dont eat grains like bread, cereal or pasta, have nuts, some meat or a boiled egg instead.