Suntan12- It is important to understand how calories are broken down in the system. For example, simple sugars and foods high in carbohydrates are processed through your system quickly as a result these foods cause you to eat more because you are not satisfied.
However, protein rich foods like tuna take longer to absorb which results in a satisfying meal that will cause you to eat less because it will take a lot longer for you to be hungry again.
Many nutritionists suggest eating some lean protein with every meal and snack to take advantage of this effect.
Using an online calorie counter and reviewing the calorie count of your favorite meals helps you to understand that not all calories are created equal.
As a matter of fact, in New York City, by law many restaurants have to disclose the calorie content chart and nutritional information of all foods served. It really does influence your decisions about what to eat.