Predicting successful weight loss after treatment.

Conducted two 8-week behavioral self-control weight reduction groups to investigate the relationship between locus of control and success at weight reduction (N = 49 female Ss). Mean weight losses were significant at post-treatment and after a 3-month and 18-month follow-up. There was no significant difference in weight loss between internals and externals at post-treatment, but internals maintained a significantly greater weight loss than externals at the follow-ups. These results are discussed with regard to self-control behavior.