Reducing your calorie intake, to lose weight can be very efficient. However, it's not so easy as it seems and you need to be really determined to starve for good. But what makes it really hard is not knowing how much calories you take with particular food. This problem has a solution - USDA National Nutrient Database offers you to search for particular food and see its nutrient and calorie values. Now go and check how many calories you had for breakfast.