The first place to start when you look at the Nutrition Facts label is the serving size and the number of servings in the package. Serving sizes are standardized to make it easier to compare similar foods; they are provided in familiar units, such as cups or pieces, followed by the metric amount (e.g., the number of grams).
It's important to note that food label nutrition information is based on a 2,000 calorie diet. Many adults and some children, particularly those who are sedentary, should consume fewer calories than this each day. Those individuals will need to adjust the “% Daily Value” information to fit their calorie profile. This tip sheet provides recommended daily calorie totals for children, youth, and adults.
Avoid oversized portions. Use a smaller plate, bowl, and glass. Portion out foods before you eat. When eating out, choose a smaller size option, share a dish, or take home part of your meal.
— Ten Tips to a Great Plate, University of Wisconsin Hospitals and Clinics
Sources
Let’s Move, Healthy Families
Changes to the Nutrition Facts Label. U.S. Food and Drug Administration (2016).