Effectiveness of a video-versus text-based computer-tailored intervention for obesity prevention after one year: A randomized controlled trial

Abstract

Computer‐tailored programs may help to prevent overweight and obesity, which are worldwide public health problems. This study investigated (1) the 12‐month effectiveness of a video‐ and text‐based computer‐tailored intervention on energy intake, physical activity, and body mass index (BMI), and (2) the role of educational level in intervention effects. A randomized controlled trial in The Netherlands was conducted, in which adults were allocated to a video‐based condition, text‐based condition, or control condition, with baseline, 6 months, and 12 months follow‐ up. Outcome variables were self‐reported BMI, physical activity, and energy intake. Mixed‐effects modelling was used to investigate intervention effects and potential interaction effects. Compared to the control group, the video intervention group was effective regarding energy intake after 6 months (least squares means (LSM) difference = −205.40, p = 0.00) and 12 months (LSM difference = −128.14, p = 0.03). Only video intervention resulted in lower average daily energy intake after one year (d = 0.12). Educational role and BMI did not seem to interact with this effect. No intervention effects on BMI and physical activity were found. The video computer‐tailored intervention was effective on energy intake after one year. This effect was not dependent on educational levels or BMI categories, suggesting that video tailoring can be effective for a broad range of risk groups and may be preferred over text tailoring.