It has been suggested that night eating is related to increased fat storage and therefore increased body weight. There is also no clear definition of what is meant by night eating. The potential effects of night eating on obesity have primarily been examined in adults to date and any studies in childhood have been cross-sectional, with none in the UK. Based on information collected in diet diaries at the age of 7, this project will aim to examine different definitions of night eating and examine the effects on childhood weight status and it's change over time. This will be carried in two different cohort studies - one based in the UK and one based in China.