I started reading a book called The Flat Belly Diet. The premise of the diet is eating healthy monounsaturated fatty acids, which includes nuts. I buy all kinds of nuts and seeds in bulk, and then I measure out 1/3 a cup (approximately 100 calories worth) and put them in snack bags. I keep them on a bowl on the counter for when I am feeling in the mood to snack. That way I know I am getting a perfect portion on the go.