As a parent I would not be happy to give consent for what could be described as an intervention which would require life long management/treatment. There are reasons to consider, an acute risk to life in the presence of additional conditions, the risk of anaesthesia, post operative infection in the light of of hospital borne infections (c Dificil and MRSA now proving increasingly harder to combat) as well as the possibility of reversal in terms of weight lost. In my opinion these questions are best answered by the individual and at an age appropriate time.