I think you have to address the issues of culture too when looking at who is to blame for diet. Coca cola ads abund with the statement, 'Coke adds life and everyone needs a bit of life'....'A Mars a day helps you work rest and play'..catchy and memorable...and we are like monkeys and copy behaviour...and parents can't be left out of this equation...as mum's and dad's influence too...economics...yes the poor will say a £1.99 chicken and chips meal is the cheapest way to feed a family...I've seen the results in their lives...'cos some people do this daily...bad...pie ads on tv are trying to make pies look sexy ..interesting isn't it!