When reading the food label, the serving size determines the basis for the foods nutrient content

Reading the Food Label the serving size determines how much food that can feed a set amount of people for example Kraft mac and cheese has a serving size of 2-4 people which means that is roughly how many people you can feed on that box .

The serving size is used to express the normal portion size of the item.  The calories, vitamins, mineral and other things listed on the label are what is one portion size.

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The answer would be a