Frequent Nutritional Feedback, Personalized Advice, and Behavioral Changes: Findings from the European Food4Me Internet-Based RCT

• Published in: American journal of preventive medicine 2019-08, Vol.57 (2), p.209-219
• Main Authors: Celis-Morales, Carlos, Livingstone, Katherine M., Petermann-Rocha, Fanny, Navas-Carretero, Santiago, San-Cristobal, Rodrigo, O'Donovan, Clare B., Moschonis, George, Manios, Yannis, Traczyk, Iwona, Drevon, Christian A., Daniel, Hannelore, Marsaux, Cyril F.M., Saris, Wim H.M., Fallaize, Rosalind, Macready, Anna L., Lovegrove, Julie A., Gibney, Mike, Gibney, Eileen R., Walsh, Marianne, Brennan, Lorraine, Martinez, J. Alfredo, Mathers, John C.
• Format: Article
• Language: English
• Subjects: Adult; Behavior change; Behavior modification; Body fat; Body mass index; Body weight; Body Weight - physiology; Clinical trials; Diet; Diet, Healthy - statistics & numerical data; Energy Intake - physiology; Europe; Evidence-based medicine; Feedback; Female; Health Behavior; Healthy food; Humans; Internet; Intervention; Male; Middle Aged; Nutritional Requirements; Obesity; Patient education; Referral and Consultation; Waist; Waist Circumference; Weight control
• ISSN: 0749-3797; 1873-2607
• DOI: 10.1016/j.amepre.2019.03.024

This study tested the hypothesis that providing personalized nutritional advice and feedback more frequently would promote larger, more appropriate, and sustained changes in dietary behavior as well as greater reduction in adiposity. A 6-month RCT (Food4Me) was conducted in seven European countries between 2012 and 2013. A total of 1,125 participants were randomized to Lower- (n=562) or Higher- (n=563) Frequency Feedback groups. Participants in the Lower-Frequency group received personalized nutritional advice at baseline and at Months 3 and 6 of the intervention, whereas the Higher-Frequency group received personalized nutritional advice at baseline and at Months 1, 2, 3 and 6. The primary outcomes were change in dietary intake (at food and nutrient levels) and obesity-related traits (body weight, BMI, and waist circumference). Participants completed an online Food Frequency Questionnaire to estimate usual dietary intake at baseline and at Months 3 and 6 of the intervention. Overall diet quality was evaluated using the 2010 Healthy Eating Index. Obesity-related traits were self-measured and reported by participants via the Internet. Statistical analyses were performed during the first quarter of 2018. At 3 months, participants in the Lower- and Higher-Frequency Feedback groups showed improvements in Healthy Eating Index score; this improvement was larger in the Higher-Frequency group than the Lower-Frequency group (Δ=1.84 points, 95% CI=0.79, 2.89, p=0.0001). Similarly, there were greater improvements for the Higher- versus Lower-Frequency group for body weight (Δ= −0.73 kg, 95% CI= −1.07, −0.38, p