A study's found that kids who drink fizzy drinks try alcohol earlier.  

The study from Seoul National University found children aged 9 to 10 who drink caffeinated soft drinks daily were twice as likely to try alcohol within a year.  

The researchers say the study can't show if the soft drinks are causing differences in behaviour and brain activity.  

Auckland University nutritionist Dr Sally McKay told Kate Hawkesby that many RTDs look and taste like fizzy drinks.  

She says it can be a natural change, given they're already quite familiar. 

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