Compared to no intervention or minimal interventions (pamphlets, usual care), interactive computer-based interventions are an effective intervention for weight loss and weight maintenance. Compared to in-person interventions, interactive computer-based interventions result in smaller weight losses and lower levels of weight maintenance. The amount of additional weight loss, however, is relatively small and of brief duration, making the clinical significance of these differences unclear.
A randomized comparison of two motivationally enhanced Internet behavioral weight loss programs.
Sixty-six women participated in this study, which compared two 16-week motivationally enhanced weight loss interventions. Both intervention groups, which are entitled "Minimal" and "Enhanced" throughout the description that follows, received a motivationally enhanced initial face-to-face weight loss session. The initial session was followed by a 16-week Internet behavioral weight loss program, which included a study website with weekly lessons, an online self-monitoring diary form, web links to related sites, and separate message boards. The Enhanced group also received weekly moderated online chat group sessions led using motivational techniques.
                Both groups lost weight over time (p<0.001), however the group by time interaction was non-significant (p=0.19). The Minimal group lost 5.22+/-4.72 kg and the Enhanced group lost 3.71+/-4.46 kg. In the Enhanced group, online chat session attendance averaged 8.0 of the 16 chats offered. Greater program utilization was associated with greater weight loss in both groups.
                The addition of weekly motivationally enhanced online chats did not increase weight loss in this study. Further research is needed on the type and frequency of group support that is most desirable and beneficial in Internet weight loss interventions and could also explore building motivation for program utilization.