It is the typical amount of a food eaten at one time. For example, a usual serving size of milk is 1 cup. Manufacturers will use the standard of one cup for one portion of milk. Directly listed under serving size, you will find servings per container. This information is especially important if there is more than 1serving per container, because all of the nutrients and calories stated on the label are based on 1 serving.
Calories are the amount of energy in a food item and are always listed on the label.
On a 2000 calorie diet, this amounts to about 65 grams of fat per day. Percent daily value should also be considered, as you read food labels. It helps you rate the nutritional quality of the food item. Percent daily values are based on a 2000 calorie diet. Age, activity, growth and illness are factors that can increase or decrease the need for calories.