1. National Institute for Health and Clinical Excellence
2. World Health Organisation (WHO) 2015 http://www.who.int/mediacentre/factsheets/fs311/en/
3. 2007 https://www.gov.uk/government/uploads/system/uploads/attachment_data/file/287937/07-1184x-tackling-obesities-future-choices-report.pdf
4. Health and Social Care Information Centre 2014 http://healthsurvey.hscic.gov.uk/support-guidance/public-health/health-survey-for-england-2014/adult-obesity.aspx
5. National Obesity Observatory (NOO) 2014 http://www.noo.org.uk/NOO_about_obesity/severe_obesity