Junk food adverts could soon be banned from childrens’ television.Health Secretary John Reid is considering the move to stop food producers targetting youngsters with unhealthy snacks, following concern over worrying levels of childhood obesity.The House of Commons health committee has criticised ministers, the NHS, food manufacturers and advertisers for not doing enough to tackle the epidemic.

But Mr Blair said: “I am responsible for many things, but I can’t make people slimmer.”

The committee’s report said obesity has grown by almost 400% in 25 years, with three-quarters of adults now overweight or obese.

England has the fastest growing obesity problem in Europe, with childhood obesity tripling in 20 years.

And the report calculates that being overweight or obese costs the nation £7.4bn a year.

Speaking on Breakfast with Frost, Mr Blair said: “Being Prime Minister I should keep within the bounds of Government policy. But I do think we can get this issue in the wrong place. The prime responsibility for people looking after themselves is with people.”

The committee called for a voluntary withdrawal of TV advertising of junk food to children.

It particularly highlighted high-profile campaigns using sports stars and celebrities to promote crisps and chocolate.

But it warned that if action was not taken by the industry within three years, the Government should step in to introduce more direct regulation.