The amount of food a person chooses to eat is best described by the term Portion Size.
Here’s a brief explanation of the options provided:
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Serving Size: This refers to a standard amount of food or drink used to help guide portion control, usually specified on nutrition labels.
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Diet: This refers to the overall pattern of food and drink that a person consumes regularly.
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Total Calories: This refers to the total number of calories consumed in a given quantity of food and drink.
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Portion Size: This specifically refers to the amount of food that a person decides to eat at a meal or snack, which can vary independently from recommended serving sizes.
So, the correct answer is Portion Size.