Background The use of Internet and technology as a medium of delivering online nutrition education (ONE) has increased; however, evidence-based studies exploring factors that contribute to best practices in online interventions have not been standardized. Objective To identify factors that contributed to successful ONE interventions for research studies published between 2009 and 2018. Study Design, Settings, Participants Following the PRISMA guidelines, studies on nutrition education interventions delivered via Internet, computer, or text messages were identified through PubMed, Medline, Web of Science, Science Direct, and Educational Resources Information Center (ERIC) database. Twenty seven studies that met inclusion criteria were screened. The Grading of Recommendations Assessment, Development and Evaluation (GRADE) system was used to determine the quality of each study included. Measurable Outcome/Analysis The primary analytic goal was to determine the overall effectiveness of ONE interventions according to their stated objective. Factors that were analyzed included: use of theory, recruitment and implementation methods, intervention duration, participant engagement, and study fidelity. Results Of the 27 studies, 21 studies delivered their interventions via websites, three through smartphone application, one via text messages, and one as an online course. Six factors associated with successful ONE interventions were identified: use of tailored messages/individualized feedback; participants engagement as measured by the level of interaction between investigators and participants; intervention duration ≥ three months; identification of specific targeted behaviors vs. general health; alignment of intervention activities with stated objectives; and use of theory-based interventions. The review identified several factors considered as poor design of ONE interventions, including comparison bias, lack of specific details on duration/dosage, lack of objective measurement, and lack of tracking system. Conclusion This review found that ONE interventions are more likely to be effective when they include tailored messages and/or individualized feedback, offer regular interaction between participants and investigators, and commit adequate duration for the intervention. Funding None.
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