Objective: To evaluate the effectiveness of (brief obesity group therapy) BOG as a psychological treatment compared to a control group (CG) in reducing weight, BMI and blood pressure and metabolic profile in patients with obesity and heart disease. To evaluate the effectiveness of the BOG on improving repertoires for coping with stressful situations related to obesity. Verify changes in behaviors that cause emotional suffering and relief from suffering based on the perception of participating patients. Design and method: Controlled clinical trial with patients with obesity and cardiovascular (CV) disease (hypertension, coronary artery disease and/or heart failure). Method: Clinical data (weight, BMI, blood pressure (BP), blood glucose, cholesterol levels, triglycerides) were collected from the electronic medical records before and after the intervention in BOG e CG. Quantitative variables (clinical data and coping strategies) expressed by means and standard deviations were compared by the T-Student test. Qualitative variables (behaviors causing emotional suffering, emotional reactions) were analyzed by thematic content analysis and Wilcoxon test Results: Thirty-eight patients with obesity and CV disease were studied, 19 for each group. After the BOG group therapy, there was a significant (p<0.05) reduction in BMI, weight, and systolic BP of the patients (Before: 39±6 kg/m2, 102±22 kg, 149±24 mmHg vs. after 34±7 kg/m2, 91±24 kg, 132±13 mmHg). In CG, there was a significant (p<0.05) increase in BMI, weight and systolic BP (Before: 35±5 kg/m2, 91±27 kg, 161±28 mmHg vs. after 36±5 kg/m2, 93±21 kg, 171±31 mmHg). We did not observe significant differences in laboratory variables in both groups. It was observed an improvement in the use of active coping, positive reinterpretation and self-distraction and a reduction in the use of maladaptive copings of self-blame, denial and behavioral disinvestment. A reduction in negative feelings, an increase in positive feelings and an attenuation of the desire to eat were identified. Conclusions: BOG was effective and brought clinical benefits in patients with obesity and CV disease, with significant reductions in weight, BMI and systolic BP, in addition to improvements in psychological aspects. It should be considered as a psychological treatment.