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A 3-ounce portion of poultry, beef, fish, or pork is equivalent to the size of a deck of cards.
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A 1-ounce portion of cheese is the size of a domino.
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A medium fruit is the size of a tennis ball.
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A cup of vegetables is the size of a baseball.
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Half a cup of grains is about the size of the palm of your hand (unless you have gigantic hands!).