Background: Although experts claim that computer-tailored interventions provided over the Internet have great potential to promote health behavior change, few studies have tested the efficacy of computer-tailored lifestyle interventions online-delivered over the Internet. Purpose: To evaluate the short-term (1 month) efficacy of an Internet-delivered, computer-tailored lifestyle intervention targeting saturated fat intake, physical activity (PA), and smoking cessation, and to evaluate exposure to the intervention. Methods: A pretest-posttest randomized controlled trial with an intervention group and a no intervention waiting list control group was conducted. Self-reported behavior and determinants were assessed at baseline and 1 month follow-up. Exposure to the intervention was monitored through server registrations. The data were analyzed using multiple linear and logistic regression analysis. Results: The intervention resulted in a significantly lower self-reported saturated fat intake (b=-0.76, p<0.01) and a higher likelihood of meeting the PA guidelines among respondents who were insufficiently active at baseline (OR=1.34, 95%CI=1.001-1.80). No significant intervention effects were found for self-reported smoking status. Of the participants, 81% actually visited the website. Conclusions: The Internet-delivered, computer-tailored lifestyle intervention was effective in reducing self-reported saturated fat intake and in increasing self-reported PA among participants who completed the study.

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Keywords Computer-tailored, Diet, Internet, Physical activity, Smoking
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Journal Annals of Behavioral Medicine
Oenema, A, Brug, J, Dijkstra, A, de Weerdt, I, & de Vries, H. (2008). Efficacy and use of an internet-delivered computer-tailored lifestyle intervention, targeting saturated fat intake, physical activity and smoking cessation: A randomized controlled trial. Annals of Behavioral Medicine, 35(2), 125–135. doi:10.1007/s12160-008-9023-1