How do you know what is the serving size? The United States Department of Agriculture has kept a serving size for fruit or vegetables to be equivalent to one-half cup. Greens like spinach and lettuce have a serving size equal to one full cup.
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One serving of sliced fruit is one half cup; however a single piece of fruit, such as an apple or an orange is as good as one serving. How did the USDA decide that one-half cup is a serving size? The decision was based on the portion sizes that people typically eat, ease of use and nutritional content of fruits and vegetables.
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