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Randomized Controlled Trial
. 2022 Feb;122(2):363-370.e6.
doi: 10.1016/j.jand.2021.07.008. Epub 2021 Aug 27.

Influence of the San Francisco, CA, Sugar-Sweetened Beverage Health Warning on Consumer Reactions: Implications for Equity from a Randomized Experiment

Anna H Grummon  1 , Alexandria E Reimold  2 , Marissa G Hall  3
Affiliations
Randomized Controlled Trial

Influence of the San Francisco, CA, Sugar-Sweetened Beverage Health Warning on Consumer Reactions: Implications for Equity from a Randomized Experiment

Anna H Grummon et al. J Acad Nutr Diet. 2022 Feb.

Abstract

Background: In 2020, San Francisco, CA, amended an ordinance requiring warning labels on advertisements for sugary drinks to update the warning message. No studies have evaluated consumer responses to the revised message.

Objectives: To evaluate responses to the 2020 San Francisco sugary drink warning label and to assess whether these responses differ by demographic characteristics.

Design: Randomized experiment.

Participants and setting: During 2020, a convenience sample of US parents of children aged 6 months to 5 years (N = 2,160 included in primary analyses) was recruited via an online panel to complete a survey. Oversampling was used to achieve a diverse sample (49% Hispanic/Latino[a], 34% non-Hispanic Black, and 9% non-Hispanic White).

Methods: Participants were randomly assigned to view a control label ("Always read the Nutrition Facts Panel") or the 2020 San Francisco sugary drink warning label ("SAN FRANCISCO GOVERNMENT WARNING: Drinking beverages with added sugar(s) can cause weight gain, which increases the risk of obesity and type 2 diabetes."). Messages were shown in white text on black rectangular labels.

Main outcome measures: Participants rated the labels on thinking about health harms of sugary drink consumption (primary outcome) and perceived discouragement from wanting to consume sugary drinks. The survey was available in English and Spanish.

Statistical analyses performed: Ordinary least squares regression.

Results: The San Francisco warning label elicited more thinking about health harms (Cohen's d = 0.24; P < 0.001) than the control label. The San Francisco warning label also led to more discouragement from wanting to consume sugary drinks than the control label (d = 0.31; P < 0.001). The warning label's influence on thinking about harms did not differ by any participant characteristics, including age, gender, race/ethnicity, education, income, or language of survey administration (all P values for interactions > 0.12).

Conclusions: San Francisco's 2020 sugary drink warning label may be a promising policy for informing consumers and encouraging healthier beverage choices across groups with diverse demographic characteristics.

Keywords: Policy; Randomized experiment; Sugar-sweetened beverages; Sugary drinks; Warnings.

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Conflict of interest statement

Conflict of Interest: The authors declare no conflicts of interest.

Figures

Figure 1.
Figure 1.
Control label and San Francisco warning label used in the online randomized experiment
Figure 2.
Figure 2.. CONSORT flow diagram for an online randomized experiment evaluating the 2020 San Francisco sugary drink warning label
aLess than half of median response time in a soft launch of the survey.
Figure 3.
Figure 3.. Impact of San Francisco warning on thinking about health harms and perceived message effectiveness in an online randomized experiment of US adults
***p<0.001
See this image and copyright information in PMC

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