Weight Management Using the Internet: A Randomized Controlled Trial Original Research Article

Background Most weight-loss research targets obese individuals who desire large weight reductions. However, evaluation of weight-gain prevention in overweight individuals is also critical as most Americans become obese as a result of a gradual gain of 1–2 pounds per year over many years. Method This study evaluated the efficacy of an Internet-based program for weight-loss and weight-gain prevention with a two-group, prospective, randomized controlled trial. A military medical research center with a population of 17,000 active-duty military personnel supplied 446 overweight individuals (222 men; 224 women) with a mean age of 34 years and a mean BMI of 29. Recruitment and study participation occurred 2003–2005 and data were analyzed in 2006. Participants were randomly assigned to receive the 6-month behavioral Internet treatment (BIT, n=227) or usual care (n=224). Change in body weight, BMI, percent body fat, and waist circumference; presented as group by time interactions, were measured. Results After 6 months, completers who received BIT lost 1.3 kg while those assigned to usual care gained 0.6 kg (F(df=366)=24.17; I<0.001). Results were similar for the intention-to-treat model. BIT participants also had significant changes in BMI (–0.5 vs +0.2 kg/m2; F(df=366)=24.58); percent body fat (–0.4 vs +0.6%; F(df=366)=10.45); and waist circumference (–2.1 vs –0.4 cm; F(df=366)=17.09); p<0.001 for all. Conclusions Internet-based weight-management interventions result in small amounts of weight loss, prevent weight gain, and have potential for widespread dissemination as a population health approach. Trial Registration NCT00417599.