• James W Krieger, Nadine L Chan, Brian E Saelens, Myduc L Ta, David Solet, and David W Fleming.
• Public Health Department of Seattle and King County, Chronic Disease and Injury Prevention Section, 401 5th Avenue, Suite 900, Seattle, WA 98104, USA. james.krieger@kingcounty.gov
• Am J Prev Med. 2013 Jun 1; 44 (6): 595-604.

BackgroundThe federal menu labeling law will require chain restaurants to post caloric information on menus, but the impact of labeling is uncertain.PurposeThe goal of the current study was to examine the effect of menu labeling on calories purchased, and secondarily, to assess self-reported awareness and use of labels.DesignSingle-community pre-post-post cross-sectional study. Data were collected in 2008-2010 and analyzed in 2011-2012.Setting/Participants50 sites from 10 chain restaurants in King County, Washington, selected through stratified, two-stage cluster random sampling. A total of 7325 customers participated. Eligibility criteria were: being an English speaker, aged ≥ 14 years, and having an itemized receipt. The study population was 59% male, 76% white non-Hispanic, and 53% aged<40 years.InterventionA regulation requiring chain restaurants to post calorie information on menus or menu boards was implemented.Main Outcome MeasuresMean number of calories purchased.ResultsNo significant changes occurred between baseline and 4-6 months postregulation. Mean calories per purchase decreased from 908.5 to 870.4 at 18 months post-implementation (38 kcal, 95% CI=-76.9, 0.8, p=0.06) in food chains and from 154.3 to 132.1 (22 kcal, 95% CI=-35.8, -8.5, p=0.002) in coffee chains. Calories decreased in taco and coffee chains, but not in burger and sandwich establishments. They decreased more among women than men in coffee chains. Awareness of labels increased from 18.8% to 61.7% in food chains and from 4.4% to 30.0% in coffee chains (both p<0.001). Among customers seeing calorie information, the proportion using it (about one third) did not change substantially over time. After implementation, food chain customers using information purchased on average fewer calories compared to those seeing but not using (difference=143.2 kcal, p<0.001) and those not seeing (difference=135.5 kcal, p<0.001) such information.ConclusionsMean calories per purchase decreased 18 months after implementation of menu labeling in some restaurant chains and among women but not men.Copyright © 2013. Published by Elsevier Inc.

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