People with mental illness in the United States are almost twice as likely to be obese compared with those without a mental illness. Lifestyle factors, such as poor dietary choices and physical inactivity, are often cited as causes of obesity in this population, which limits the response to the obesity epidemic primarily to behavioral change interventions. In response, this project is grounded in a human rights framework to assure that the people most affected by the problem are included in understanding and addressing the problem. We sought to investigate social and structural factors that affect weight loss in partnership with community co-researchers enrolled in a group lifestyle program for overweight/obese people with serious mental illness (SMI) living in supportive housing settings.