Eating Disorders (ED) (full and partial syndrome anorexia nervosa and bulimia nervosa and binge eating disorder) are life- threatening illnesses that start in adolescence and affect between one and two in ten adolescents and young adults. There is a lack in our understanding of why eating disorders develop, which affects our ability to develop treatment and adequately prevent eating disorders. This project builds on our previous studies in ALSPAC, showing that metabolism and growth might play a role in the development of eating disorders. We aim to combine metabolic function, body composition, blood and inflammatory markers, as well as genetic information to understand progression and development of eating disorders and related symptoms in the 3 generations of ALSPAC participants. This study will be fundamental in understanding how eating disorders develop and progress across the life span.