Public health experts are calling for unhealthy drinks to be taken out of Saturday sport.
A recent study from the Otago University has shown that many of the sports drinks children use on Saturday are filled with sugar.
Most children within the survey thought the drinks were good for them because they were packaged and advertised as helping people play sport better.
The lead researcher, Moira Smith, said such drinks were putting children at risk of obesity and tooth decay.
Dr Smith said children who played Saturday morning sport do not need sports drinks for extra energy or re-hydration.
For any activity up 90 minutes long water is the best option for children.
Do you use a sports drink when you are playing sport?