Khan has some horror stats to back it up too, warning that almost 40 per cent of London children aged either 10 and 11 are either overweight or obese, so they won't be able to stand of the right-hand side of the escalators soon as they'll take up the entire width of the stairs by the time they've become lumbering 18-year-olds.
Lobby group the Advertising Association pointed out that Britain already bans the advertising of high fat, sugar and salt content food and drink products in media where children make up more than 25 per cent of the audience.
"I think globally that's incredible".
The Mayor of London Sadiq Khan has revealed his strategy to improve London's environment.
Arsenal will challenge for Premier League title next season - Wenger
A new goalkeeper should be a priority in the summer but the need is perhaps even greater in defence. It is a worrying statistic which underlines the size of the task facing Wenger's successor.
The publication follows one of City Hall's largest ever strategy consultations with nearly 3,000 Londoners and 370 stakeholders responding to the draft strategy.
In a statement, the Mayor's office argued the availability of cheap fast food was a class issue, with children from poorer backgrounds more likely to be overweight.
"That is why I am proposing to ban adverts for harmful junk food from our entire Tube and bus network", he added.
And a bus company in Canberra, Australia, introduced a similar policy in 2015 as part of a crackdown on advertising.
"The increase of obesity in the United Kingdom is multidimensional, aspects of which include socioeconomic status, physical inactivity as well as what we eat, how much we eat and when we eat".
Cancer Research UK's director of cancer prevention, Alison Cox, said it would be "a really great step for London", where junk food advertising dominates in several boroughs.