 The aim of this systematic review was to identify intervention components that are associated with increased change in diet and or physical activity in individuals at risk of type 2 diabetes. The review included 30 systematic reviews of interventions targeting diet and or physical activity in adults at risk of developing type 2 diabetes from 1998 to 2008. The results showed that interventions produced clinically meaningful weight loss, 3 to 5 kilograms at 12 months, 2 to 3 kilograms at 36 months, and increased physical activity, 30 to 60 minutes a week of moderate activity at 12 to 18 months. Causal analyses indicated that intervention effectiveness was increased by engaging social support, targeting both diet and physical activity, and using well-defined established behavior change techniques. Increased effectiveness was also associated with increased contact frequency and using a specific cluster of self-regulatory behavior change techniques, goal-setting, self-monitoring. No clear relationships were found between effectiveness and intervention setting, delivery mode, study population, or delivery provider. Evidence on long-term effectiveness suggested the need for greater consideration of behavior maintenance strategies. The review concludes that specific components are associated with increased effectiveness in interventions to promote change in diet and or physical activity, and practitioners and commissioning organizations should consider including these components to maximize the efficiency of programs for diabetes prevention. This article was authored by Evans-Philip H, Rodan Michael, Harderman Wendy, and others. We are article.tv, links in the description below.