Ormiston Weight Loss Service

Ormiston Hospital offers a highly skilled professional team who work together to deliver the Ormiston Weight Loss Service (OWLS). Our team understands that being overweight is not simply a weight problem, but a chronic condition that affects the entire body. Our team of experts provide the very best care and the support you need on your journey to weight loss and overall well being.

Ormiston Weight Loss Service

At OWLS we regularly help people transform their lives. OWLS patients succeed in their weight loss goals because they have the holistic support they need; over 12 months after surgery. The team includes our highly experienced surgeon and caring support from our dietitian, psychologist and physiotherapist. Contact us to reach out today. 

Bariatric Surgery

Weight Loss Surgery is the only scientifically proven method for long term and effective weight loss. Bariatric surgery is not a quick-fix cure.  Weight loss still depends on healthy eating and exercise, which is why OWLS has set up a support network to help patients on their journey.

OWLS patients not only achieve weight loss, but often see a reduction in many obesity related conditions such as type II diabetes, sleep apnoea, joint pain, lipid abnormalities and high blood pressure – these are either completely resolved or substantially improved.

Surgery is advised for people who have tried other weight loss methods without long-term success. Ormiston Hospital, Auckland’s premier private hospital, has been providing these surgeries for over a decade now and our surgeons have over 20 years experience.

Read more about our two types of surgeries below; gastric sleeve and gastric bypass.

Gastric Sleeve

Gastric sleeve surgery is a popular surgical weight loss surgery. This can sometimes also be known as stomach stapling. In this laparoscopic procedure, a large portion of the stomach is removed and the remaining stomach is significantly smaller – a narrow tube called a sleeve. This  sleeve helps to restrict food intake, which leads to weight loss.  Our patients see excellent results after this procedure and some can expect to lose half their body weight.*

Our surgeons are highly experienced in performing this operation and have done so on thousands of patients. Our discrete location means we offer a private and comfortable experience for patients located.

Gastric Bypass

During gastric bypass surgery changes are made to your stomach and small intestine to permanently affect the way they absorb and digest food. This is a highly successful surgery for those wanting to lose a lot of weight as it helps to make ongoing hormonal changes.

Gastric bypass aids weight loss by:

  • Restricting the amount of food that your stomach holds
  • Limiting the amount of calories and nutrients your body absorbs
  • Changing gut hormones, which help you feel fuller longer, contribute to appetite suppression and the reversal of obesity-caused metabolic syndrome

Gastric bypass surgery is performed to help lose weight and can decrease the risk of serious health conditions such as diabetes, high blood pressure, heart disease and stroke. Much like gastric sleeve surgery the stomach is smaller and fills easily with less food: this decreases the number of daily calories and boosts weight loss.


Once you know you are interested in surgery you will book in a consultation to meet with one of our surgeons; Dr Andrew MacCormick or Dr Habib Rahman. You can make a booking by emailing us directly with your enquiry. After your consultation you will be put on a special pre-surgery diet, after seeing your surgeon again and dietitian you will be then booked in for surgery. It is also recommended you meet with the clinical psychologist we work with through The Psychology Group, if you contact them directly please let them know you are an OWLS patient. As the changes that come with surgery are permanent and impact your life in many ways, it is important to get the help you need.


Recovery varies between patients.  Bariatric surgery patients can stay for two nights in one of our beautifully appointed private hospital rooms. Our physiotherapist visits you throughout your stay to help you get moving and offer post surgery exercise advice.

We encourage OWLS patients to stay in hospital to ensure they are comfortably back on their feet again, you may request a longer stay before your procedure at your own cost. We offer modern private en-suite rooms, with wifi, sky TV, and fresh meals prepared onsite tailored to bariatric patients.. You can speak to your surgeon about how much time you will need.

ready for weight llossReady?

If you are ready to make take the next step in your weight loss journey, please take a look at our surgeon profiles below and decide who you would like to meet with. From there, you can contact the surgeon or email OWLS to make a booking for a consultation for surgery.

OWLS team

Our team of experts are here to support you and guide you on your weight loss journey. You can email owls@ormistonhospital.co.nz to make an enquiry directly with our friendly team. Our two highly experienced bariatric surgeons are listed below and you can read more about them on our website:

Andrew MacCormick

Habib Rahman

Alice Baynham – Physiotherapist

Ormiston Hospital offers the best and safest procedures available for surgical and nonsurgical weight loss. Contact us to reach out today. 

*Results vary