Effectiveness of Web-Based Personalized Nutrition Advice for Adults Using the eNutri Web App: Evidence From the EatWellUK Randomized Controlled Trial

Rodrigo Zenun Franco, Rosalind Fallaize, Michelle Weech, Faustina Hwang, Julie A Lovegrove, Rodrigo Zenun Franco, Rosalind Fallaize, Michelle Weech, Faustina Hwang, Julie A Lovegrove

Abstract

Background: Evidence suggests that eating behaviors and adherence to dietary guidelines can be improved using nutrition-related apps. Apps delivering personalized nutrition (PN) advice to users can provide individual support at scale with relatively low cost.

Objective: This study aims to investigate the effectiveness of a mobile web app (eNutri) that delivers automated PN advice for improving diet quality, relative to general population food-based dietary guidelines.

Methods: Nondiseased UK adults (aged >18 years) were randomized to PN advice or control advice (population-based healthy eating guidelines) in a 12-week controlled, parallel, single-blinded dietary intervention, which was delivered on the web. Dietary intake was assessed using the eNutri Food Frequency Questionnaire (FFQ). An 11-item US modified Alternative Healthy Eating Index (m-AHEI), which aligned with UK dietary and nutritional recommendations, was used to derive the automated PN advice. The primary outcome was a change in diet quality (m-AHEI) at 12 weeks. Participant surveys evaluated the PN report (week 12) and longer-term impact of the PN advice (mean 5.9, SD 0.65 months, after completion of the study).

Results: Following the baseline FFQ, 210 participants completed at least 1 additional FFQ, and 23 outliers were excluded for unfeasible dietary intakes. The mean interval between FFQs was 10.8 weeks. A total of 96 participants were included in the PN group (mean age 43.5, SD 15.9 years; mean BMI 24.8, SD 4.4 kg/m2) and 91 in the control group (mean age 42.8, SD 14.0 years; mean BMI 24.2, SD 4.4 kg/m2). Compared with that in the control group, the overall m-AHEI score increased by 3.5 out of 100 (95% CI 1.19-5.78) in the PN group, which was equivalent to an increase of 6.1% (P=.003). Specifically, the m-AHEI components nuts and legumes and red and processed meat showed significant improvements in the PN group (P=.04). At follow-up, 64% (27/42) of PN participants agreed that, compared with baseline, they were still following some (any) of the advice received and 31% (13/42) were still motivated to improve their diet.

Conclusions: These findings suggest that the eNutri app is an effective web-based tool for the automated delivery of PN advice. Furthermore, eNutri was demonstrated to improve short-term diet quality and increase engagement in healthy eating behaviors in UK adults, as compared with population-based healthy eating guidelines. This work represents an important landmark in the field of automatically delivered web-based personalized dietary interventions.

Trial registration: ClinicalTrials.gov NCT03250858; https://ichgcp.net/clinical-trials-registry/NCT03250858.

Keywords: EatWellUK; FFQ; app; diet quality scores; dietary intervention; eNutri; food frequency questionnaire; healthy eating index; mHealth; nutrition app; personalized nutrition; precision nutrition; web-based.

Conflict of interest statement

Conflicts of Interest: None declared.

©Rodrigo Zenun Franco, Rosalind Fallaize, Michelle Weech, Faustina Hwang, Julie A Lovegrove. Originally published in the Journal of Medical Internet Research (https://www.jmir.org), 25.04.2022.

Figures

Figure 1
Figure 1
CONSORT (Consolidated Standards of Reporting Trials) flow diagram for the EatWellUK study. n values are expressed as percentages of the number of participants who were randomized (N=364). RCT: randomized controlled trial.
Figure 2
Figure 2
User evaluation of the web-based personalized nutrition report using a Likert scale (N=108). Inconsistencies in the sum of percentages is due to the rounding of the percentages.
Figure 3
Figure 3
Follow-up questionnaire responses in the personalized nutrition group using a Likert scale (N=42). Inconsistencies in the sum of percentages is due to the rounding of the percentages.

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