coraltoes, have you seen the recommended food triangle? I think you will find it is high carb. My sister is a GP & although she agrees with me that we eat far too many carbs for the human body (why the else would people be getting fatter & type II diabetes be rising year on year?), the medical advice she is allowed to give out is eat less, excercise more & eat a low fat diet. It doesn't work. The BMC have acknowledged it doesn't work. Up until 60 odd years ago, to lose weight people avoided "farinacious foods", cutting out bread, potatoes & cakes.
Like I said before, I am not fat (I'm far, far too vain) & I firmly believe that each individual has the power to change their own lives - but I think that current medical advice & the society in which we live where huge corporations endlessly & constantly promote extremely unhealthy food (coke, sweet drinks, chocolate, sweets, sugary cereals, cakes, biscuits) is also partly to blame.
Anyway, I should go off & rant about this somewhere else, as it is not relevant to the very specific issue in this thread. It is however, related to the broader question of why people are fat & therefore taking up so much room on planes.
However, I'll just leave you with this thought. Next time you see a seriously overweight person walking down the street, imagine how hard your heart would be working if you were carrying the weight they carried & then think again about calling them lazy.