Objective. To explore relationships between concerns and physical activity and body mass index (BMI) among a racially/ethnically diverse low-income population. Method. A cross-sectional survey documented behavioral risks among racially/ethnically diverse low-income residents in the Boston area (2005-2009). Multivariable logistic regressions were conducted in 2012 for each concern, using SAS version 9.2. Results. Those very/moderately concerned about weight were more likely to have higher BMIs, be in the preparation/action stage, received behavioral counseling, participated in a weight management program, and be interested in participating in one in the future. Those very/moderately concerned about physical activity were more likely to have higher BMIs, received behavioral counseling, and participated in a physical activity program. Conclusion. Individuals with elevated BMIs or low levels of physical activity are concerned. While level of concern is important, these findings suggest that it is not likely to be a sufficient catalyst to behavior change.