The more frequently you log on, the more weight you can keep off

The more people used an interactive weight management website, the more weight loss they maintained, according to a Kaiser Permanente Center for Health Research study published online today in the open access Journal of Medical Internet Research.

The National Institutes of Health-funded study evaluated an Internet-based weight maintenance intervention involving 348 participants. Consistent website users who logged on and recorded their weight at least once a month for two-and-a-half years maintained the most weight loss, the study found.

"Consistency and accountability are essential in any weight maintenance program. The unique part of this intervention was that it was available on the Internet, whenever and wherever people wanted to use it," said study lead author Kristine L. Funk, MS, RD, a researcher at the Kaiser Permanente Center for Health Research in Portland, Ore.

"This study shows that if people use quality weight management websites consistently, and if they stick with their program, they are more likely to keep their weight off," said study co-author Victor J. Stevens, PhD, co-author and senior investigator at the Kaiser Permanente Center for Health Research. "Keeping weight off is even more difficult than losing it in the first place, so the fact that so many people (in the study) were able to maintain a good portion of their weight loss is very encouraging to us."

This internet-based weight maintenance intervention was part of the Weight Loss Maintenance Trial, one of the largest and longest weight maintenance trials ever conducted—lasting three years and including more than 1,600 people at four study sites across the United States. To enroll in the trial, participants had to be overweight or obese based on their Body Mass Index and taking medication for high blood pressure or high cholesterol. For the first six months, participants tried to lose weight by attending weekly group meetings at which they were weighed, encouraged to keep food diaries, and given extensive information about exercise and healthy eating.

Participants had to lose at least nine pounds to remain in the trial for the weight loss maintenance phase, which lasted an additional two-and-a-half years and included three groups of randomized participants: one with no intervention, one that had monthly contact with a personal health coach, and one that was given unlimited access to a weight-maintenance website created specifically for the trial.

The internet group included 348 participants who were encouraged to log in at least once a week. If they didn't, they received e-mail reminders and follow-up automated phone messages. Once on the website, participants were prompted to record their weight, their minutes of exercise, and the number of days they kept food diaries. If they went longer than seven days without recording a weight, the other parts of the website were disabled until they did record their weight. The website included an interactive bulletin board on which participants could talk with others involved in the study and pose questions to nutrition and exercise experts.