(CNN) London Mayor Sadiq Khan said Friday that junk food advertising will be banned on the city's entire public transportation network from February, as part of a plan to tackle childhood obesity.

Restrictions will come into force February 25 and will cover all advertising for foods and non-alcoholic drinks high in fat, salt and sugar. This will include products such as chocolate bars, sugary drinks and burgers.

Khan proposed the ban in May and the mayor's online discussion platform, Talk London, received 1,500 responses to the consultation, with an 82% approval rating for the proposal.

Sadiq Khan described the crisis of childhood obesity in London as a 'ticking timebomb' and said he had seen 'overwhelming support' for the ban.

Khan described the crisis of childhood obesity as a "ticking timebomb."

"It's clear that advertising plays a huge part in the choices we make, whether we realize it or not, and Londoners have shown overwhelming support for a ban on adverts for junk food and drink on our transport network," he said in a statement.

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