1. WHO (2021) Obesity and Overweight. World Health Organisation. https://www.who.int/news-room/fact-sheets/detail/obesity-and-overweight
2. WHO (2019) Global Database on Body Mass Index. World Health Organization. http://www.assessmentpsychology.com/icbmi.htm
3. Public Health England (2017) Health Matters: Obesity and the Food Environment. GOV.UK. Public Health England. https://www.gov.uk/government/publications/health-matters-obesity-and-the-food-environment/health-matters-obesity-and-the-food-environment--2
4. NHS Digital (2019) Health Survey for England, 2018: Quick Guide. Health Survey for England 2018 [NS]. https://digital.nhs.uk/data-and-information/publications/statistical/health-survey-for-england/2018
5. NICE (2013) Overview. Fertility Problems: Assessment and Treatment. Guidance,| NICE. Nice.org.uk. https://www.nice.org.uk/guidance/CG156