Bijker, RimkeKhullar, HiranyaTe Ao, BradenRodda, Simone2026-05-202026-05-202026-05-14Nutrition and Health, ISSN: 0260-1060 (Print); 2047-945X (Online), SAGE Publications, 2601060261450642-. doi: 10.1177/026010602614506420260-10602047-945Xhttp://hdl.handle.net/10292/21162Background: Excessive sugar consumption is a major public health concern, yet effective, scalable interventions remain limited. Aim: To explore the effects of a brief online intervention of personalised normative feedback (PNF) on sugar consumption, mental well-being, craving, and self-efficacy at one and two months in New Zealanders. Methods: Random assignment was to PNF on sugar consumption with feedback on mental wellbeing, craving, and self-efficacy scores, and information on strategies for change or a personalised summary of total sugar consumption and scores on measures. The main outcome was change in sugar intake from baseline, assessed using a self-reported Food Frequency Questionnaire (FFQ). Secondary outcomes were change in craving strength, craving frequency, self-efficacy and mental well-being. Results: A total of 605 participants were recruited over a four-week period. Most participants were female (86%), aged >45 years (56%), and consumed sugar within the recommended 10% daily energy intake limit (72%). Sugar consumption reduced by 10.2% at one-month post-intervention (Cohen's d = −0.27; 95% CI [−0.43, −0.11]), and this change was maintained at two months. Improvements were found for all secondary outcomes except mental well-being. There were, however, no significant group-by-time interactions for sugar intake or other outcomes. Conclusion: PNF shows promise in improving sugar consumption, but outcomes were similar to offering a personalised summary of scores alone. Given rapid recruitment and strong retention, future research should compare these conditions with a true control group that provides no feedback. Further work should also examine the reliability and validity of the FFQ for measuring sugar consumption.© The Author(s) 2026. Creative Commons License (CC BY 4.0). This article is distributed under the terms of the Creative Commons Attribution 4.0 License (https://creativecommons.org/licenses/by/4.0/) which permits any use, reproduction and distribution of the work without further permission provided the original work is attributed as specified on the SAGE and Open Access page (https://us.sagepub.com/en-us/nam/open-access-at-sage).https://creativecommons.org/licenses/by/4.0/Personalised normative feedbackdietary interventiondigital health interventionfree sugar intakerandomised controlled trial32 Biomedical and Clinical Sciences3210 Nutrition and DieteticsHealth Disparities and Racial or Ethnic Minority Health ResearchPreventionBehavioral and Social ScienceHealth DisparitiesClinical ResearchClinical Trials and Supportive Activities3.1 Primary prevention interventions to modify behaviours or promote wellbeingOral and gastrointestinalStroke3 Good Health and Well BeingJournal ArticleOpenAccess10.1177/02601060261450642