I appreciate your answer, unfortunately our medicals are around the corner, i don't have time to loose weight that allow us to get below the mark. I understand and have to face the decline id that as most certainly will be. It will be a blow but it is definitely a lesson learned the hard way...
If you are declined on health reasons you have options.
If the skills for the job you have secured are in short supply you have option of applying for a medical waiver. This is considered by Immigration on the basis that you being in NZ providing your skills far outweighs any health issues.
Also another option is to apply for a different type of visa.
When you apply for a Residency visa then Immigration must consider you for a lifetime.
If you apply for a Temporary Work Visa instead your health can only be considered for a maximum of 3 years (maximum length of this visa type).
The visa term awarded will coincide with the job offer or contract length. These visas are only awarded to people who have a job offer and the job and employer forms part of its conditions.
If the job offer is permanent then it is likely you will be awarded a Temporary Work Visa for 3 years.
You could make a deal with your employer to only offer a contract of maximum 12 months each time.
As the length of the job offer / contract shortens so does the length of time Immigration have to consider your health.
For a Temporary Work Visa of between 6 months and 12 months duration you do not need to submit a General Medical Certificate or X-rays and the acceptable standard of health does not mention BMI for temporary entrants.
You could do this for the first year which allows you entry and then in that year, lose the weight.
If you don't manage to lose the weight in the first year you could re-apply to be awarded another Temporary Work Visa for another year, but be aware you are running out of time.
These visas will only allow entry for 3 years. In that time it is expected that people with permanent job offers who want to stay apply for Residency to allow a permanent stay but then medicals and X-rays are required.
http://glossary.immigration.govt.nz/healthrequirementstemporary.htm