In new zealand what is guideline to have stomach by pass i have diabetes and gaining weight?

Depends : Depends where you live. Generally speaking because it's drastic bmi greater than 28 and failed treatment with lifestyle changes but also need to be under certain target wt anyway re maximum operating table capacity. Suggest consult with your doctor to discuss all the options

Bariatric surg: Go to your Gp. Get referred to the weight loss clinic in hospital. The other alternative is to get a bar attic surgeon referral program n public system. There are criteria for referral which your GP should know . The surg is not public ally funded for all patients and has strict criteria for acceptance If you wish to go private then the cost in ball park of $15000/- .

Ministry of Health: NZ Ministry guidelines published in 2009 which are very clear that surgery is a last resort option that is only recommended if all non-surgical options have been tried and failed. Then it is offered to people with BMI > 40 or BMI >35 if they have a related illness (e.g. diabetes). Weight loss is really hard. See your GP to get as much help as possible! (e.g. dietician referral). Good luck!