Via reader JW, an exceptional experiment from Yale:

In a field experiment conducted during trick-or-treating at Halloween, we find that a visual cue of Michelle Obama prompts almost twice as many children age 9 and over to choose fruit over candy, compared to a visual cue of Ann Romney. This provides evidence that Michelle Obama’s campaign to promote healthy eating has succeeded in influencing behavior. No such evidence was found for children age 8 and below.

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