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Increased consumption of sugar-sweetened beverages has contributed to rising obesity levels. Under Canadian law, calories for prepackaged foods and beverages are presented by serving size; however, serving sizes differ across products and even for the same product in different containers. This study examined consumer understanding of calorie amounts for government nutrition labels and industry labelling schemes.

A national sample of 687 Canadian adults completed an online survey. Participants were randomized to view images of Coke® bottles that displayed different serving sizes and calorie amounts. Participants viewed either the regulated nutrition information on the “back” of containers, or the voluntary calorie symbols displayed on the “front” of Coke® products. Participants were asked to determine how many calories …