Efficacy of calorie labelling for alcoholic and non-alcoholic beverages on restaurant menus on noticing information, calorie knowledge, and perceived and actual influence on hypothetical beverage orders: a randomized trial

Objectives To test the efficacy of calorie labelling for alcoholic and non-alcoholic beverages on restaurant menus on noticing calorie information, calorie knowledge, and perceived and actual influence on hypothetical beverage orders. Methods Participants included upper-level university students of legal drinking age residing in Ontario, Canada (n = 283). Using a between-groups experiment, participants were randomized to view one of two menus: (1) No Calorie Information (control), and (2) Calorie Information adjacent to each beverage. Participants completed a hypothetical ordering task, and measures related to noticing calorie information, calorie knowledge, and actual and perceived influence of calorie information on beverages ordered were assessed. Linear, logistic, and multinomial logistic regression models were used to examine the four outcomes. Results The odds of noticing calorie information were significantly higher in the Calorie Information (72.6%) versus No Calorie Information condition (8.0%) (OR = 43.7, 95% CI: 16.8, 113.8). Compared to those in the No Calorie Information condition, participants in the Calorie Information condition had significantly lower odds of responding 'Don't know' (OR = 0.04, 95% CI: 0.02, 0.09), underestimating (OR = 0.06, 95% CI: 0.02, 0.2), and overestimating (OR = 0.05, 95% CI: 0.02, 0.2) versus accurately estimating calories in beverages ordered. No significant differences were observed between menu labelling conditions in the calories in beverages ordered or the perceived influence of calorie information on the number of beverages ordered. Conclusion Exposure to menus with calorie information increased consumers noticing the calorie information, and accurately estimating calories in alcoholic and non-alcoholic beverages ordered. These results have implications for policy-makers considering mandatory menu labelling policy inclusive of alcoholic beverages.