Immigrant status, acculturation and risk of overweight and obesity in adolescents living in Madrid (Spain): the AFINOS study.

Prior studies have identified a link between length of residence and overweight (including obesity) in immigrant populations. However, this link has not been confirmed in Europe. This study compares overweight prevalences in native Spanish and immigrant adolescents living in the Madrid region (Spain), and whether length of residence affects the risk of immigrant adolescents being overweight. The study population was a representative sample of adolescents aged 13-17 years (n = 2,081, 1,055 girls) who lived in Madrid. Data were collected from November 2007 to February 2008 through a cross-sectional survey in which self-reported height and weight were used to calculate BMI. Overall, no significant difference was detected in overweight risk between the Spanish and immigrant adolescents. However, immigrant adolescents residing in Spain for 6 years or under did show a higher overweight risk than both the Spanish adolescents (OR 1.57) and immigrants who had lived in Spain for longer than 6 years (OR 1.98). Changes in lifestyle associated to a longer duration of residence in Spain seems to have a slightly protective effect on the risk of being overweight in immigrant adolescents.