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According to Self‐Determination Theory, when motivation to reach an objective is fully internal, it is said to be "autonomous"; when driven by external incentives, it is said to be "controlled". Previous research has indicated that autonomously motivated individuals show better response to treatments for eating disorders. Objective: In individuals undergoing different intensities of outpatient treatment for an eating disorder, we sought to assess associations between autonomous and controlled motivations and response to treatment on the one hand, and likelihood of dropping out of treatment, on the other. Method: Seven hundred seventy adults meeting DSM‐5 criteria for an eating disorder (216 with Anorexia Nervosa, 282 with Bulimia Nervosa, and 272 with Other Specified Feeding or Eating Disorder) were included in this study. Before an interval of outpatient treatment, individuals completed the Eating Disorder Examination Questionnaire and the Autonomous and Controlled Motivations for Treatment Questionnaire. Participants completed the Eating Disorder Examination Questionnaire again at one or two subsequent timepoints. Results: After controlling for diagnosis, treatment intensity, and number of previous treatments, analyses showed that higher autonomous motivation was associated with better response on eating‐disorder overall symptoms and lower likelihood of dropping out of treatment. In contrast, controlled motivation was not associated with response to treatment. Discussion Our results suggest that autonomous motivation has trans‐diagnostic influence upon response to various intensities of treatment for an eating disorder. In support of an autonomy supportive approach to treatment, findings link autonomous motivation with more favorable outcome. [ABSTRACT FROM AUTHOR]

Objective Across diverse clinical problems, therapists' autonomy support has been found to increase patients' autonomous motivation for change. Being self-motivated has, in turn, been linked to superior treatment response. In people undergoing outpatient eating disorder (ED) treatment, we examined associations among ratings of autonomy support received from therapists and other carers, self-reported engagement in therapy, and clinical outcomes. Method Ninety-seven women with anorexia nervosa, bulimia nervosa, or a related ED provided measures of motivational status and clinical symptoms at the beginning and end of time-limited (12-16 weeks) segments of specialized treatment. At mid-treatment, patients also rated the extent to which they perceived their individual therapists, group therapists, group-therapy peers, family members, friends, and romantic partners as being autonomy supportive. Results Overall, multiple regression analyses indicated autonomy support to moderate (rather than mediate) the link between initial autonomous motivation and later change in autonomous motivation-with results indicating that, independently of ED diagnosis or treatment intensity, greater perceived autonomy support (from therapists and nontherapists alike) coincided with larger increases in autonomous motivation over the course of therapy. In turn, higher autonomous motivation at end-of-therapy coincided with larger reductions in eating symptoms. Discussion Findings suggest that the experience of autonomy support (from therapists and nontherapists) is associated with increasing motivation in people undergoing ED treatment, and that becoming self-motivated is linked to better outcomes. Such results indicate that support from therapists, relatives, and peers can favorably influence personal engagement in individuals undergoing ED treatment. [ABSTRACT FROM AUTHOR]