A leading expert warns a sugar tax is needed as the soft drink industry can't be trusted and says obesity levels could decrease.

<p>A leading expert warns a sugar tax is needed as the soft drink industry can't be trusted and says obesity levels could decrease.</p>

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<p>Listen to the best bits of 3AW Mornings &amp; exclusive interviews here - and don't forget to tune in live between 8.30am and midday. [http://www.3aw.com.au/](http://www.3aw.com.au/)</p>

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