Advertising junk food could soon be banned from children's content streamed online in a bid to tackle the obesity epidemic, the UK's advertising watchdog has said.

Adverts for unhealthy products high in fat, sugar or salt are already banned on children's television, but authorities will soon launch a consultation on whether to roll this out to all media - including websites, print and billboards.

The move comes as concern is growing over the childhood obesity epidemic and the rising numbers of children having their rotten teeth taken out.

A campaign spearheaded by Jamie Oliver calling for a sugar tax has attracted widespread support and shone a spotlight on the role industry and legislation play in tackling health problems.

The Committee of Advertising Practice (CAP), which draws up advertising rules, will soon launch a full public consultation on whether to tighten rules for ads online.