I can't be specific, but by giving me WLS my chances of becoming diabetic, like my father, are greatly reduced. Dad is in a wheelchair and is partially sighted, all because of his diabetes, he has to go to the foot clinic fortnightly, which means an ambulance ride there and back, has had laser surgery on both eyes several times, not to mention the cupboard filled with pills and potions, the district nurse having to visit everyday for a couple of years to redress his foot.
Avoiding any sort of long term health problem with this operation will save the NHS much more than they are spending, and they even told me that the operation 'pays for itself' in many ways.