Children grow used to healthy snacks and would even choose them in school according to the American Peanut Council and the Californian Prune Board.

A survey of 2,000 secondary school pupils in England found that fatty and sugary foods such as burgers, crisps and confectionery were among the favourite snacks, while 66% would not buy nuts, seeds and dried fruit if they were the only snacks on sale in school.

However, following tasting sessions with flavoured peanuts and dried fruit, 95% of pupils said they would buy such snacks in school and 84% would recommend them to their friends.

Joe Harvey, director for the Health Education Trust, said: "By September 2007 snacks such as crisps will no longer be available in school. It is important to ensure the healthy snacks on offer are tasty and the right price."