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Is the 3rd sentence in the passage paraphrased as the following sentence?

We decide how much to eat not only as a function of how much food we actually consume, but by a comparison to its alternatives.

I mean, does the sentence mean, 'We decide how much to eat by a comparison to its alternatives as well as as a function of how much food we actually consume.'?

Relativity works as a general mechanism for the mind, in many ways and across many different areas of life. For example, Brian Wansink, author of Mindless Eating, showed that it can also affect our waistlines. We decide how much to eat not simply as a function of how much food we actually consume, but by a comparison to its alternatives. Say we have to choose between three burgers on a menu, at 8, 10, and 12 ounces. We are likely to pick the 10­ounce burger and be perfectly satisfied at the end of the meal. But if our options are instead 10, 12, and 14 ounces, we are likely again to choose the middle one, and again feel equally happy and satisfied with the 12­ounce burger at the end of the meal, even though we ate more, which we did not need in order to get our daily nourishment or in order to feel full.

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The sentence is puzzling but from the subsequent illustration I think what the writer means is that:

It is not only our need for food that affects how much we decide to eat, but also the options on the menu.

(Other interpretations would be welcome!)

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