i just can't resist a research challenge!! it took longer than i thought it would take, but here's the abstract of the paper that started it all. just a quick look suggests that the data should not be generalized to the entire universe. the program was OPTIFAST and is now known as the Novartis Nutrition program http://www.optifast.com/.
so, IMO the main finding of this study was that 5% of people who use supervised liquid weight loss programs keep their weight off. and it doesn't apply to members of WW or whatever. not that their rates are fabulous, but they're certainly better than this 5%!!!!
and, for all of you who like this sort of information, Stampfer and Colditz started the Nurses Health Study, and hired a young epidemiologist/MD named Walter Willett. Willett's nutrition conclusion arise from the data from the nurses, from the Physician's health study, and from the study on other women healthcare professionals [which has some serious socioeconomic biases built into the population, but we'll skip that for now].
ENJOY!
Three-year follow-up of participants in a commercial weight loss program. Can you keep it off?
Grodstein F, Levine R, Troy L, Spencer T, Colditz GA, Stampfer MJ.Arch Intern Med. 1996 Jun 24;156(12):1302-6.
Channing Laboratory, Department of Medicine, Brigham and Women's Hospital, Harvard Medical School, Boston, Mass., USA.
BACKGROUND: One third of Americans are obese, according to the 1988-1991 National Health and Nutrition Endpoint Survey III survey. Obesity increases the risk of death and a variety of chronic diseases. Numerous commercial weight loss programs demonstrate short-term success. OBJECTIVE: To assess maintenance of weight loss achieved during dieting. METHODS: We surveyed 192 participants in the Sandoz Nutrition (Sandoz Pharmaceuticals, Minneapolis, Minn) diet program approximately 3 years after participation. Initial date were supplied by the diet clinics and follow-up data, including weight at various points after the program, participation in other weight loss programs, and lifestyle variables, such as exercise, smoking, and television watching, were collected by a mailed questionnaire. RESULTS: On average, the group lost 22 kg during the diet program. After the follow-up period, the mean weight (mean, 102.6 kg) was only modestly less than the group's original weight at the start of the diet (mean, 105.9 kg). Twelve percent of the subjects maintained 75% of their weight loss after leaving the diet program, 57% maintained at least 5% of the loss, and 40% gained back more than they had lost during the diet. The frequency of exercise after the diet program was the strongest predictor of weight loss maintenance, while television viewing predicted a gain in weight. CONCLUSION: Given the apparent lack of substantial, long-term success at weight reduction, perhaps greater emphasis should be placed on prevention of obesity.
PMID: 8651838 [PubMed - indexed for MEDLINE]