What is the difference between a portion and a serving?
A portion is how much food you choose to eat at one time, whether in a restaurant, from a package, or at home. A serving, or serving size, is the amount of food listed on a product's Nutrition Facts, or food label
Different products have different serving sizes, which could be measured in cups, ounces, grams, pieces, slices, or numbers—such as three crackers. A serving size on a food label may be more or less than the amount you should eat, depending on your age, weight, whether you are male or female, and how active you are. Depending on how much you choose to eat, your portion size may or may not match the serving size.
How much should I eat?
How many calories you need each day to lose weight or maintain your weight depends on your age, weight, metabolism, whether you are male or female, how active you are, and other factors. For example, a 150-pound woman who burns a lot of calories through intense physical activity, such as fast running, several times a week will need more calories than a woman about the same size who only goes for a short walk once a week.
The Dietary Guidelines for Americans 2015-2020 can give you an idea of how many calories you may need each day based on your age, sex, and physical activity level. Use the Body Weight Planner tool to make your own calorie and physical activity plans to help you reach and maintain your goal we
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