Inviting Consumers to Downsize Fast-Food Portions Significantly Reduces Calorie Consumption.

Schwartz et al. (2012)
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Summary by 
Mark Egan

In contrast to McDonald’s old policy of asking whether you want to super-size your order, these three field experiments asked customers in a Chinese restaurant if they wanted to down-size their portions of side dishes. The 14- 33% of customers who did so did not compensate by ordering more in other areas and ate 200 less calories on average.