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Its decision follows mounting pressure on the food and drinks industry to develop more responsible products to battle the UK's obesity crisis.

The policy is being introduced as the brand makes its first foray into the mineral water market, with Calypso Rapidz, a flavoured natural mineral water aimed at health-conscious teenagers.

A spokesman said that the launch marked a change in strategy for the drinks company, which previously focused on developing drinks for children such as cup drinks and freezer pops.

The company is considering supporting the launch with a TV ad campaign.

Calypso claims it sells more than 500m cup drinks a year in the UK.