BACKGROUND: To examine the effects of a 6 month lifestyle intervention on quality of life, depression, self-efficacy and eating behavior changes in overweight and obese endometrial cancer survivors. METHODS: Early stage endometrial cancer survivors were randomized to intervention (n = 23) or usual care (n = 22) groups. Chi-square, Student's t-test and repeated measures analysis of variance were used in intent-to-treat analyses. Outcomes were also examined according to weight loss. RESULTS: Morbidly obese patients had significantly lower self-efficacy, specifically when feeling physical discomfort. There was a significant improvement for self-efficacy related to social pressure (p = 0.03) and restraint (p = 0.02) in the LI group. There was a significant difference for emotional well-being quality of life (p = 0.02), self-efficacy related to negative emotions (p < 0.01), food availability (p = 0.03), and physical discomfort (p = 0.01) in women who lost weight as compared to women who gained weight. Improvement in restraint was also reported in women who lost weight (p < 0.01). CONCLUSION: This pilot lifestyle intervention had no effect on quality of life or depression but did improve self-efficacy and some eating behaviors. TRIAL REGISTRATION: http://www.ClinicalTrials.gov NCT00420979.

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