Effect of a story-based, animated video to reduce added sugar consumption: A web-based randomized controlled trial.

Background: Short and animated story-based (SAS) videos, which can be rapidly distributed through social media channels, are a novel and promising strategy for promoting health behaviors. In this study, we evaluate the effectiveness of a SAS video intervention to reduce the consumption of added sugars.

Methods: In December 2020, we randomized 4159 English-speaking participants from the United Kingdom (1:1:1) to a sugar intervention video, a content placebo video about sunscreen use (no sugar message), or a placebo video about earthquakes (no health or sugar message). We nested six list experiments in each arm and randomized participants (1:1) to a control list or a control list plus an item about consuming added sugars. The primary end-points were mean differences (on a scale of 0-100) in behavioral intent and direct restoration of freedom to consume added sugars.

Results: Participants (N = 4013) who watched the sugar video had significantly higher behavioral intent to cut their daily intake of added sugar (mean difference (md) = 16.7, 95% confidence interval (CI) = 1.5-31.8,  = 0.031), eat fresh fruit daily (md = 16.7, 95% CI = 0.5-32.9,  = 0.043), and check food labels for sugar content (md = 20.5, 95% CI = 2.6-38.5,  = 0.025) when compared with the sunscreen (content placebo) video. The sugar video did not arouse intent to restore freedom and consume added sugars when compared with the two placebo videos.

Conclusions: Our SAS intervention video did not arouse reactance and increased short-term behavioral intent among participants to reduce their consumption of added sugars. SAS videos, which draw on best practices from the entertainment-education media, communication theory, and the animation industry, can be an effective strategy for delivering emotionally compelling narratives to promote health behavior change.

Trial Registration: German Clinical Trials Register: DRKS00022340.