[The base data from Weight Watcher's groups as the parameter for long-term follow-up of weight reduction].

The available data of members of Weight Watchers groups were statistically evaluated and their efficiency is discussed with respect to the underlying therapeutic concept. As a result of the data evaluation and the discussion of the literature it can be concluded: 1. The time of active membership in the group correlates with the weight loss. 2. Dropouts can be expected at the beginning of the therapy and have usually a greater obesity than other members. An early motivation has to consider the slower success in those people with a high degree of obesity. 3. A continuous motivation and re-motivation is of greatest importance to prevent any weight gain after the end of group therapy. This re-motivation program should be established within the group; members who succeeded in losing weight should return for meetings at regular intervals.