The two main types of weight loss surgery are gastric bypass surgery and gastric sleeve surgery.
I offer both of these main types of surgery including several variations of gastric bypass surgery.
I perform these surgeries laparoscopically, resulting in shorter recovery times and a lower risk of complications. Both gastric sleeve and gastric bypass surgeries are effective for weight loss, but the best option depends on each individual patient.
Gastric bypass surgery
Gastric bypass surgery involves reducing the size of the stomach to a small pouch and connecting it to the small bowel downstream to reduce absorption of calories. There are various versions of this type of weight loss surgery, including one anastomosis gastric bypass (aka mini bypass), Roux-en-Y gastric bypass, and revision bypasses.
- Restricts food intake by reducing stomach size.
- Alters digestion by bypassing part of the small intestine.
- Typically results in greater weight loss compared to sleeve gastrectomy.
- May lead to better management of diabetes and metabolic syndrome.
- Has a lower risk of developing gastroesophageal reflux disease (GERD) post-surgery.
Gastric sleeve surgery
Sleeve gastrectomy reduces the size of the stomach by trimming it to a narrow tube that stays in continuity with the duodenum and small bowel. Most of the stomach is removed. The small bowel is not connected to the pouch.
- Reduces stomach size, limiting food intake.
- Removes the part of the stomach that produces the hunger hormone ghrelin.
- Is usually performed laparoscopically.
- Can result in loss of approximately 60% of excess weight within two years.
- May improve or resolve conditions like heart disease, high blood pressure, and type 2 diabetes.
- Has a lower risk of vitamin deficiencies compared to gastric bypass.
- Can be a good first-stage procedure for very large patients (BMI > 55 kg/m²).

Weight loss surgery
Click the sections below to watch videos and learn more about each surgery.
Please note that techniques may differ slightly from mine.
How long will you have to wait for surgery?
I aim to minimise waiting and worrying by providing a clear, timely process from consultation to surgery, typically completed within six weeks. This is what the process usually looks like:
-
24
hours
From initial referral to booking consultation
-
+2
weeks
From call to consultation
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+4
weeks
From consultation to surgery
-
+
Follow up as needed

What to expect
- During your consultation We’ll review your medical history together and discuss the issues you’re having to help me determine the best course of action to help you reach your goals.
- After your consultation We’ll book you in for surgery and provide detailed pre-operation information and instructions to make sure you fully understand what to expect on the day of the surgery, including a detailed outline of your planned post-surgery care.
Patient information for weight loss surgeries
Download our pre- and post-op patient guides for more information on what to expect during the process. Please note, these are general information brochures. When you are booked in for your surgery, you’ll receive any personalised information and details about your specific procedure.


Find out if weight loss surgery is right for you
Book a consultation today to discuss your options and see how I can help.
FAQs
I am an independent surgeon, but I operate out of St George’s Hospital, one of Christchurch’s leading healthcare facilities. Enjoy comfortable surroundings and the support of dedicated nursing staff delivering quality care throughout your stay.
Weight loss surgery typically requires a 2-night stay.
Visit the FAQs if you have more questions, or get in touch with me for any other concerns.