Portion and serving size is an important part of planning a meal.
A portion is the amount of food that you choose to eat for a meal or snack. It can be big or small—you decide.
A serving is a measured amount of food or drink, such as one slice of bread or one cup (eight ounces) of milk.
Many foods that come as a single portion actually contain multiple servings. The Nutrition Facts label on packaged foods—on the backs of cans, sides of boxes, etc.— tells you the number of servings in the container.
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Source: National Heart, Lung, and Blood Institute