Gastric Bypass Surgery Perth

Gastric Bypass has been used for nearly 50 years now. It combines restriction with malabsorption and offers very good long-term weight loss results. Long term results show that gastric bypass surgery will help you keep weight off even after 15 years. It is one of the most effective treatments for type II diabetes.

The Gastric Bypass Operation

This procedure is usually performed via a laparoscopic (keyhole) approach under general anaesthesia.

Whilst your gastric bypass surgeon may have recommended laparoscopic (keyhole) surgery, he/she may find that, after starting the procedure, this approach is not safe due to unexpected findings or events. If this is the case, then your surgeon may need to convert to a large incision (approximately 10 to 15cm in length) in the abdomen. This is known as open surgery or “laparotomy”.

How does it work?

Weight loss by gastric bypass surgery is achieved by the following mechanisms:
1. Early satiety (feeling satisfied) with a smaller portion size occurs because there is now a small gastric pouch.
2. Over-eating results in discomfort and vomiting.

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How Much Weight Will I Lose?

For most patients, gastric bypass surgery will result in the loss of 50-70% of excess weight which means you will have lost enough weight to reduce your obesity-related health problems.

Maintaining good eating habits and regular exercise are very important for long term success. Our Dietitians and psychologist will assist you in making the necessary lifestyle changes.

You will expect to have very good control of most obesity related co-morbidities such as Type II Diabetes Mellitus, Elevated Blood Pressure, Sleep Apnoea, Lipid Abnormalities, and Joint Pain etc.

If you have certain medical conditions then the gastric bypass ought not to be considered: for example, if you have gastric ulcers, polyps or gastritis.

This procedure is not easily reversed so you need to be absolutely certain that is the right operation for you before proceeding. Advice from your Dietitian will be as important as the advice provided by your Surgeon.

Significant weight loss will have an effect on the physical and psychological consequences of obesity.

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Gas Pain

Gas pain is one of the most vexing problems that some patients experience during the third and fourth day after the gastric bypass operation. This pain can be either very severe or mild. This pain is relieved by walking and passing gas.

Surgery Risks

The general risks of surgery, and of rapid weight loss, apply to this operation just like the adjustable gastric band.


Occasionally patients may feel lightheaded because they are not drinking as much liquid as they were able to do before having the surgery. We advise patients to aim to drink 1.5 litres of fluid per day.

Altered Bowel Habits

Bowel habits may be altered after the surgery. Initially, some patients may have watery bowel movements. For most, bowel habits will become regular with one reduced quantity bowel movement every day.

The bypass is a major operation and the risk of complications is higher than with gastric banding or sleeve gastrectomy. The bypass means that certain foods are poorly absorbed, and these issues must be discussed with your doctors and dietitian.

The operation is literally a by-pass of the stomach. Food that is eaten goes into a small gastric pouch and then into a loop of small bowel (the jejunum).


During the first two months following surgery, many patients will probably experience a few episodes of vomiting. It may occur if you eat too quickly, fail to chew your food adequately or eat inappropriate foods. By following the dietary advice strictly, you will alleviate these problems.

Another common experience in patients who have had gastric bypass surgery can be vomiting white, frothy material early each morning. This is actually normal saliva.

After surgery, patients are obviously consuming a much smaller quantity of food and therefore requiring a much smaller quantity of saliva than the glands are used to producing.


Nausea is a side effect of the gastric bypass operation.

This is the side effect from the operation that is responsible for some of the massive rapid weight loss that is seen after the gastric bypass operation. Nausea can be alleviated by eating at least three or four small meals a day and drinking at least three to four cups of water a day.

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Weight Loss Surgeons

Prof Jeff Hamdorf AM
Prof Jeff Hamdorf AMSurgeon

Upper Gastrointestinal and Bariatric Surgeon based at Hollywood Private Hospital in Nedlands. Professor Hamdorf established Western Surgical Health, leader in team approach to morbid obesity. MORE

Dr Sue Taylor
Dr Sue TaylorSurgeon

Doctor Sue Taylor is a leading female general surgeon in Perth, who contributes to the Bariatrics Australia Weight Control program as a Bariatric Surgeon. MORE

Dr Ruth Blackham
Dr Ruth BlackhamSurgeon

Ruth is a Consultant General Surgeon and Bariatric Surgeon. She completed eleven years of postgraduate training since finishing her undergraduate degree in Medicine and Surgery in 2004. She is a trainer and facilitator for the Royal Australasian College of Surgeons and Senior Lecturer with the University of Western Australia. MORE

Contact Us Now

At Western Surgical Health in Perth, we’re here to help you every step of the way. Our care is unique in that we provide highly specialised professionals all at one location to support you in your surgery

.Our team includes:

– Specialised Bariatric Surgeons (both male and female)
– General Surgeons (both male and female)
– Bariatric GPs (both male and female)
– Accredited Practising Dietitians
– Specialised Psychologists