Health experts are warning retailers to ask for I.D. to ensure they do not sell energy drinks to anyone under 16.

The Safe Food group says the drinks are not suitable for children and wants to see a voluntary code introduced which would only allow adults to buy them.

The latest research shows that there has been a massive surge in the number of energy products on the market, with some brands containing up to 16 teaspoons of sugar in a single can.

The highest consumers are officially boys aged between 15 and 24.

Dr Cliodhna Foley-Nolan, Director of Human Health & Nutrition with Safe Food, says people need to treat energy drinks like more dangerous substances.

Dr Foley-Nolan said: “Retailers who are taking their responsibility seriously, should have a voluntary code asking for proof of age for people who are purchasing these products.

“Particularly teenagers who may be using them with alcohol, you know we do require that for alcohol and tobacco.”