Modern laparoscopic theatres
Gastric bypass surgery, also known as Roux-en-Y gastric bypass, is a bariatric procedure that reduces the size of the stomach and changes part of the digestive pathway. As gastric bypass changes both stomach capacity and the way food passes through part of the digestive system, it requires careful assessment, preparation and long-term nutritional follow-up.
At OptiWeight, gastric sleeve surgery is part of a wider, team-based approach to weight management. Specialist general surgeon Dr Ashok Gunawardene will assess your health history, weight history, risks, goals and clinical needs before discussing whether gastric bypass may be appropriate for your circumstances. He will also explain how it compares with other bariatric options, such as gastric sleeve surgery.
Gastric bypass surgery changes the digestive system in two ways. First, a smaller stomach pouch is created, which limits how much food you can comfortably eat. This pouch is then connected directly to a lower section of the small intestine, so food bypasses part of the stomach and the upper small intestine.
A second connection, further along, allows digestive juices to mix with food so it can be properly digested. This two-connection arrangement is what gives the procedure its name, Roux-en-Y gastric bypass.
By reducing stomach capacity and altering the digestive pathway, gastric bypass may reduce how much food a person can comfortably eat, influence appetite-related signals and affect how some nutrients are absorbed. It is usually performed using keyhole (laparoscopic) techniques.
Gastric bypass involves significant and generally permanent changes to the digestive system. Suitability depends on an individual assessment, including your health history, weight management history, risks, goals and clinical needs. It should be considered as part of a broader weight management plan rather than a standalone solution.
When clinically appropriate and combined with ongoing lifestyle changes and follow-up care, gastric bypass surgery may offer potential benefits beyond weight loss alone. Depending on your individual health and circumstances, these may include:
As gastric bypass affects digestion and gut hormone signals, it may be considered for selected patients with certain weight-related health concerns, including type 2 diabetes or reflux symptoms.
Outcomes vary from person to person and depend on factors such as your health history, your starting weight and the ongoing lifestyle changes you maintain. During your consultation, Dr Ashok will provide clear, realistic guidance on what gastric bypass surgery may offer in your individual circumstances.
Gastric bypass surgery is not suitable for everyone, and suitability is determined through individual clinical assessment. As a general guide, gastric bypass surgery may be considered for adults who:
For some patients, including those with conditions such as type 2 diabetes or reflux, gastric bypass may be considered over other procedures. Suitability is always assessed individually, taking into account your overall health, medical history, weight history, risk profile and readiness for surgery. A personalised assessment with Dr Ashok is the best way to understand whether it may be suitable for you.
The cost of gastric bypass surgery in Melbourne varies depending on your individual circumstances and your level of private health insurance. For self-funded patients, an all-inclusive laparoscopic gastric bypass starts at approximately $25,000 and may include hospital, theatre, bed, consumables, anaesthetist, surgeon, and assistant fees.
If you have appropriate private health insurance, your out-of-pocket costs may be lower, as some hospital and theatre fees may be covered by your health fund. Medicare and private health fund rebates may also apply, subject to eligibility criteria.
During your consultation, the OptiWeight team will provide an itemised estimate of fees and expected out-of-pocket costs before any treatment is arranged. You are encouraged to contact the clinic if you have questions about consultation fees, procedure costs, rebates or funding options.
At OptiWeight, your care starts with a detailed consultation, where Dr Ashok takes the time to listen to your concerns and answer your questions. He will assess your health, weight history and any weight-related health concerns, and discuss whether gastric bypass surgery may be appropriate for your circumstances, including the potential benefits, risks, limitations and recovery considerations. He can also explain how gastric bypass compares with other bariatric procedures, such as gastric sleeve surgery.
Before surgery, some patients may need further assessment to help plan their care safely. This may include investigations such as a gastroscopy, sleep study, echocardiogram or manometry, depending on your symptoms, medical history and risk profile.
You will also be supported by a bariatric dietitian from OptiWeight’s multidisciplinary team, who will provide guidance on eating behaviours, nutritional safety and the pre-surgery liver-reducing diet.
If you proceed with gastric bypass surgery, your procedure will be performed by Dr Ashok at either Northern Private Hospital in Epping or St Vincent’s Private Hospital in Werribee. The procedure is performed under general anaesthesia and commonly uses keyhole, or laparoscopic, techniques where clinically appropriate.
During Roux-en-Y gastric bypass, a small stomach pouch is created and connected directly to a lower section of the small intestine, changing the path food takes through the digestive system. A second connection, further along, allows digestive juices to mix with the food so it can be digested. The details of your procedure, including risks and recovery considerations, will be explained before surgery.
After surgery, you will receive guidance on recovery, eating progression, activity levels and follow-up care. You will usually follow a staged diet over several weeks, starting with liquids, then progressing to softer foods and eventually to more regular textures, as advised by your care team.
Ongoing nutritional and clinical support forms an important part of care after gastric bypass surgery. As the procedure can affect nutrient absorption, long-term vitamin and mineral supplementation and regular monitoring are generally required. Dr Ashok will typically review surgical patients at 2 weeks, 6 weeks, 12 weeks, 6 months and 12 months after surgery, with longer-term follow-up at 6–12 monthly intervals.
Gastric bypass is a major procedure and, like all surgery, carries risks. Potential risks may include:
This is not a complete list of all possible risks. Dr Ashok will discuss the potential risks relevant to your procedure and circumstances during your consultation.
FRACS
MBChB Hons
GESA
PhD
ANZMOSS
Dr Ashok Gunawardene is a registered specialist general surgeon with subspecialist training in upper gastrointestinal and weight loss surgery. With over 15 years of clinical experience across the United Kingdom, New Zealand and Australia, he brings a considered, evidence-informed approach to weight management care.
As Director of OptiWeight, Dr Ashok supports patients through both surgical and non-surgical treatment pathways, helping them understand their options and make informed decisions about their health. His approach focuses on ensuring patients feel supported, informed and respected throughout their care.
“My approach is simple: I want every patient to feel safe, supported, and never rushed. Surgery is a tool – your long-term health is the goal.”
Considering gastric bypass surgery is a significant decision. A private consultation with Dr Ashok Gunawardene gives you the opportunity to ask questions, discuss your health history and understand whether gastric bypass may be appropriate for your circumstances. Dr Ashok will explain the potential benefits, risks, alternatives and follow-up requirements before any treatment pathway is planned.
Gastric bypass changes the digestive system by creating a smaller stomach pouch and connecting it to a lower section of the small intestine. This may reduce how much food a person can comfortably eat, influence appetite-related signals and affect how some nutrients are absorbed. These changes may support weight management when combined with ongoing dietary changes, lifestyle support and follow-up care.
Gastric sleeve surgery reduces the size of the stomach without rerouting the intestine. Gastric bypass reduces stomach capacity and also changes the path food takes through part of the small intestine. Due to these differences, gastric bypass may be considered for some patients with certain weight-related health concerns, such as type 2 diabetes or reflux symptoms. The most appropriate procedure depends on your individual assessment.
Gastric bypass surgery is a major procedure and carries risks. These can include bleeding, infection, blood clots, reactions to anaesthesia, leaks, nutritional deficiencies, bowel obstruction or the need for further treatment. During your consultation, Dr Ashok will discuss the potential risks and considerations in greater detail.
The duration of gastric bypass surgery depends on your individual anatomy and the complexity of your procedure. As a general guide, Roux-en-Y gastric bypass typically takes 2 to 4 hours, though this can vary. It is commonly performed using keyhole (laparoscopic) techniques when clinically appropriate. Dr Ashok will explain the expected duration and details of your procedure during your consultation.
Gastric bypass is generally considered a permanent procedure. While it may be revised or, in rare cases, reversed, this involves further complex surgery and is not the intended outcome. Dr Ashok can discuss this in greater detail during your consultation.
Yes, gastric bypass involves permanent changes to the stomach and digestive pathway. Even so, ongoing weight management still depends on factors such as dietary changes, lifestyle habits, supplementation and follow-up care. Some patients may experience weight regain over time, which is why long-term monitoring and support form an important part of care.
Weight loss after gastric bypass varies from person to person and can depend on factors such as your starting weight, your health history and the lifestyle changes you maintain over time. Gastric bypass may support weight management, but it does not guarantee a specific result. Dr Ashok will provide realistic guidance based on your individual circumstances.
Yes, as gastric bypass changes how food and nutrients pass through the digestive system, long-term vitamin and mineral supplementation is usually needed to help prevent deficiencies. Regular blood tests and follow-up appointments help monitor your nutritional health over time.
This page is general information only and is not a substitute for personalised medical advice. Weight loss surgery is a significant decision with benefits and risks that differ for each person. Outcomes vary and cannot be guaranteed. Please consult Dr Ashok Gunawardene or your GP to discuss whether a procedure is appropriate for your individual circumstances.
