The relationship between self-monitoring, outcome expectancies, difficulties with eating and exercise, and physical activity and weight loss treatment outcomes.

BACKGROUND/PURPOSE: During a behavioral weight loss program (BWLP), weight loss and exercise can vary considerably from week to week. Weekly fluctuations in outcome expectancies and perceived difficulties with eating and exercise may be associated with weekly variability in weight loss and exercise. Also, inconsistent self-monitoring of exercise may be associated with poor weight loss and physical activity treatment outcomes. METHODS: Forty obese, sedentary participants completed a 6-month BWLP. Body weight, outcome expectancies, and difficulties with eating and exercise were assessed weekly. Weekly self-monitoring of exercise was computed from physical activity diaries. Physical activity, VO2max, and caloric intake were assessed pre- and posttreatment. RESULTS: Within-subjects analyses indicated that participants exercised less during weeks that participants reported greater difficulties with exercise, relative to weeks participants reported fewer difficulties. Participants lost significantly more weight during weeks that participants reported more positive outcome expectancies and greater difficulties with exercise, compared to weeks participants reported less positive outcome expectancies and fewer difficulties with exercise. Consistent self-monitoring of exercise was associated with fewer difficulties with exercise and greater exercise and weight loss. CONCLUSIONS: Interventions that are targeted to increase self-monitoring and to improve transient difficulties with exercise and diminished outcome expectancies may improve BWLP treatment outcomes.

Applying a stepped-care approach to the treatment of obesity.

OBJECTIVE: In a stepped-care (SC) approach to treatment, more intensive interventions are implemented when less intensive interventions prove to be insufficient. It was hypothesized that a behavioral weight loss program with SC (BWLP+SC) would evidence superior treatment outcomes when compared with a BWLP without SC (BWLP). METHODS: Forty-four obese, sedentary adults were randomly assigned to a BWLP+SC [i.e., problem-solving therapy (PST)] or a BWLP. RESULTS: Participants in the BWLP+SC lost significantly more weight and body fat, reported greater physical activity and greater improvements in diet, and were more likely to achieve their within-treatment weight loss goals than BWLP participants. Participants in the BWLP+SC who received PST (BWLP+SC [PST]) also evidenced superior treatment outcomes including superior weight loss maintenance (through 12 months posttreatment) compared with BWLP participants matched on SC eligibility [BWLP (SC matched)]. CONCLUSION: BWLP+SC may improve treatment outcomes and participant motivation to achieve preestablished weight loss goals.

Education on the glycemic index of foods fails to improve treatment outcomes in a behavioral weight loss program.

The glycemic index (GI) may play an important role in weight management by helping to control appetite and insulin levels. The impact of adding education on the GI of foods to a behavioral weight loss program (BWLP) was examined. Fifty-three obese, sedentary participants were randomly assigned to receive either a BWLP or a BWLP+GI education. Pre- and posttreatment weight loss, body fat, and diet were assessed. Weight loss and body fat were assessed at 1-year posttreatment. GI education had no significant impact on weight loss treatment outcomes at posttreatment or 1-year follow-up. Average weight loss was 7.6 kg (p<0.05). Participants in the BWLP+GI education group had significantly greater GI knowledge (p<0.05) and consumed foods with a lower average daily GI (p<0.05), than participants in the BWLP at posttreatment. At 1-year posttreatment, participants regained 59% of their posttreatment weight loss and 34% of their lost body fat. GI education did not improve BWLP treatment outcomes in this investigation.

The early identification of poor treatment outcome in a women's weight loss program.

Research examining factors associated with program attrition or failure to lose weight during active treatment has yielded mixed findings. The goal of the current investigation was to confirm and extend prior research on the predictors and correlates of attrition and failure to lose weight during treatment. This investigation examined whether baseline characteristics, early weight loss, attendance, weight-related quality of life, confidence and difficulties with eating and exercise, and diet-related thoughts and feelings during the final week of treatment were associated with percentage change in body weight. Forty-four, obese, sedentary, postmenopausal women were recruited to participate in a 24-session weight loss intervention. Poor treatment outcome (i.e., percentage change in body weight) was significantly associated with several baseline characteristics including higher body mass index (BMI), greater fat and lower carbohydrate consumption, poor body image, and greater expectations for program success. Poor treatment outcome was also significantly associated with poor program attendance, unsatisfactory early weight loss, unsatisfactory improvements in weight-related quality of life, and lower self-control and self-confidence. By the end of active treatment, women with poor treatment outcome evidenced significantly higher levels of guilt and feelings of failure. The need for early identification and intervention with participants at risk for treatment failure is discussed.