The recent growth in Ireland study has shown that 22% of Irish nine-year-olds are overweight or overweight.
This survey, tracing over 7,500 children and their families, is the fourth in a series conducted by ESRI and Trinity College Dublin, which have conducted interviews at various stages of their lives.
Overall, it paints a positive picture, with more than three quarters of nine-year-olds in good health.
However, one in eight suffered from a prolonged state of health or disability.
Only a quarter of the nine-year-olds reached the recommended activity level of at least 60 minutes each day.
15% of all nine-year-olds spent two or more hours on TV or DVD on weekdays.
Most children were healthy but 17% were overweight and 5% were overweight.
The study also found that 23% of the nine-year-olds had an online profile, such as a gaming or social media account.
Meanwhile, the children generally had positive attitudes towards school – 62% said they always enjoyed reading. 48% always thought about Maths but only 22% always thought about Irish.