 This systematic review of reviews has identified several key components that are associated with increased effectiveness in interventions to promote dietary and or physical activity changes in individuals at risk of type 2 diabetes. These include engaging social support, targeting both diet and physical activity, and using well-defined, established behavior change techniques. Additionally, increased effectiveness was also associated with increased contact frequency, and using a specific cluster of self-regulatory behavior change techniques, goal-setting, self-monitoring. Longer-term studies suggest the need for greater consideration of behavior-maintenance strategies. This article was authored by Evans Philip H, Rodin Michael, Hardiman Wendy, and others.