Three completely different kinds of food offer our calories: carbohydrates, fats and protein. Proteins and carbohydrates contain approximately the identical number of calories per ounce - about a hundred as a rule. Fats, however, contain twice as much, therefore if you wish to cut back your calorie intake, the obvious means to try to to it is to cut back on fats. Fats, paradoxically, will typically help you to manage your appetite in that they lie in your stomach for a long time and offer you a way of repletion.