1. Institute of Medicine. Nutrition During Pregnancy: Part I: Weight Gain, Part II: Nutrient Supplements. The National Academy of Sciences: Washington, DC, 1990.
2. WHO: Controlling the global obesity epidemic. WHO health topics, 2004; http://www.who.int/nutrition/topics/obesity/en/index.html [Accessed 8 May 2009].
3. National Institute for Health and Clinical Excellence. Obesity: the prevention, identification, assessment and management of overweight and obesity in adults and children. National Institute for Health and Clinical Excellence (NICE), 2006; http://www.nice.org.uk/guidance/CG43 [Accessed 21 March 2009].
4. Pregnancy weight gain: still controversial;Abrams;Am J Clin Nutr,2000
5. International Association for the Study of Obesity. International Obesity Taskforce. http://www.iotf.org/database/GlobalAdultsAugust2005.asp [Accessed December 2008].