Researchers at Newcastle University analysed advertising prior to the 2007 ban and found that hardly any junk food advertising was aired during children's programming.
Of the 1,365 food adverts analysed during 2006, around half were for junk food products but only five per cent of such adverts were screened during children's programmes.
Similar results were also found in Canada, where junk food advertising is also restricted though self-regulation.
The research paper, called Food Advertising During Children's Television in Canada and the UK, concludes that restrictions in both countries are unlikely to impact on children's eating habits.
Research author Dr Jean Adams said: "With just five per cent of advertising for such foods aired during children's programmes the policy is unlikely to make any difference.
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