This paper provides an overview of the current evidence on the relationship between obesity and ethnicity for adults and children in the UK - summarising evidence on: variations in obesity prevalence between and within minority ethnic groups; differences in obesity-related disease prevalence between minority ethnic groups, with particular reference to cardiovascular disease and type 2 diabetes; measures of obesity including the issue of central adiposity and the use of BMI; and the role of potential determinants of obesity for minority ethnic groups such as migration, cultural variations in diet, socioeconomic status, local area characteristics and physical activity levels. Published: January 2011