1. World Health Organization (WHO). Obesity and overweight: fact sheets, 2015. Available from http://www.who.int/mediacentre/factsheets/fs311/en/ (accessed 22 February 2015).
2. Centers for Disease Control and Prevention (CDC). Overweight and obesity: causes and consequences, 2015. Available from http://www.cdc.gov/obesity/adult/causes/index.html (accessed 24 February 2015).
3. National Heart, Lung and Blood Institute (NHLBI). What are the health risks of overweight and obesity? 2015. Available from http://www.nhlbi.nih.gov/health/health-topics/topics/obe/risks (accessed 24 February 2015).
4. Kark M, Rasmussen F . Growing social inequalities in the occurrence of overweight and obesity among young men in Sweden. Scand J Public Health 2005; 33: 472–477.
5. Miech RA, Kumanyika SK, Settler N, Link BG, Phelan JC, Chang VW . Trends in the association of poverty with overweight among US adolescents, 1971–2004. JAMA 2006; 295: 2385–2393.