Background
As part of a comprehensive effort to stem the rise in obesity, King County, Washington,
enforced a mandatory menu-labeling regulation requiring all restaurant chains with
15 or more locations to disclose calorie information at the point of purchase beginning
in January 2009.
Purpose
The purpose of this study is to quantify the impact of the King County regulation
on transactions and purchasing behavior at one Mexican fast-food chain with locations
within and adjacent to King County.
Methods
To examine the effect of the King County regulation, a difference-in-difference approach
was used to compare total transactions and average calories per transaction between
seven King County restaurants and seven control locations focusing on two time periods:
one period immediately following the law until the posting of drive-through menu boards
(January 2009 to July 2009) and a second period following the drive-through postings
(August 2009 through January 2010). Analyses were conducted in 2010.
Results
No impact of the regulation on purchasing behavior was found. Trends in transactions
and calories per transaction did not vary between control and intervention locations
after the law was enacted.
Conclusions
In this setting, mandatory menu labeling did not promote healthier food-purchasing
behavior.
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© 2011 American Journal of Preventive Medicine. Published by Elsevier Inc. All rights reserved.
