Executives who thought they were consuming medium-size cookies ate, on average, 0.4 ounces (12.02 grams) more of the cookies than executives who thought they were eating large cookies.
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However, those who munched on the medium cookies later said they had eaten less than those who ate large cookies…
And when subjects were given a task to do while eating, the distortions were exacerbated. For instance, participants (who made their judgments when the plate was not in front of them) said a bowl that actually held 10 mini sandwiches held only eight when it was labeled as small. But when participants had a task to do while they lunched, they said it had around seven sandwiches.
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