Many of the complications involved with obesity do not materialize until the later years of someone's life. I do not think that sporting injuries amount to obesity's £4.2 billion cost to the NHS in 2008. Happy to be proven wrong though if you can provide the evidence?
The main point still stands, unlike the USA where we have nationalised healthcare someone who isn't you is paying the bill for your lack of effort to remain at a healthy weight. At no point did i suggest we ban anything, but maybe there is some way to recover the costs?
It's been an interesting debate anyway, I mean no ill.