Coca-Cola, Pepsi and Cadbury Schweppes have agreed to stop selling carbonated drinks in US schools.

The companies have signed up to a voluntary ban where primary school children will only have access to low-fat milk and unsweetened flavoured water, but secondary schools will be able to sell diet versions of carbonated drinks.

Former US president Bill Clinton, who pushed through the voluntary ban, said: “These industry leaders recognise that childhood obesity is a problem and have stepped up to help solve it.”