How many calories you need depends on how much you weigh and how much energy your body requires just to stay alive. Calories come from three nutrients: carbohydrate, fat, and protein. As you digest food, calories are released, taken into your bloodstream and converted to blood sugar.
Energy is used during exercise. If you are a 100-pound person, you will burn this number of calories in each of these activities per minute:
Myth: Toast is lower in calories than bread. Truth: The texture is changed but not the number of calories.
Myth: Grapefruit burns calories. Truth: No food has special magic to melt away fat.
Myth: Margarine has fewer calories than butter. Truth: They are exactly the same, about 36 calories per pat.
Myth: Bread and potatoes are fattening. Truth: Neither is high in calories, but they turn into high-calorie foods with the topping used, such as butter, sour cream, mayonnaise, and other fat-laden condiments.