Gastric sleeve surgery, or sleeve gastrectomy, is one of Australia’s most commonly performed bariatric procedures, helping individuals with obesity lose weight sustainably. But the real transformation begins long before the operation. Understanding what to do before gastric sleeve surgery—from mental readiness to physical health and strict dietary changes—is essential for long-term success.
This comprehensive guide draws on recommendations from trusted Australian resources and insights from Dr Niruben Rajasagaram, a leading Melbourne-based bariatric and upper GI surgeon. With years of experience and a patient-first philosophy, Dr Niruben emphasises the importance of holistic preparation to optimise outcomes before and after gastric sleeve surgery.
Understanding the Requirements for Gastric Sleeve Surgery
Before proceeding, it’s important to understand the requirements for gastric sleeve surgery in Australia. These are medical and behavioural benchmarks set to ensure patient safety and readiness:
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BMI of 30 or more with obesity-related conditions like type 2 diabetes, hypertension, or obstructive sleep apnoea; or BMI over 35
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A history of unsuccessful weight loss attempts through lifestyle changes.
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A clear commitment to follow a structured post-operative program that includes diet, exercise, and regular follow-up care.
According to the Australian Department of Health, public funding (Medicare) may be available in select cases, though eligibility varies between public and private systems. Consult your GP or bariatric surgeon for the latest criteria.The timeline for waiting for this can take several years.
Understanding the details of gastric sleeve surgery, including its stages and expectations, can further support your preparation both mentally and physically.
How to Mentally Prepare for Gastric Sleeve Surgery
Many patients focus on the physical aspects, but learning how to mentally prepare for gastric sleeve surgery is equally important.
1. Set Realistic Expectations
Knowing what to do before gastric sleeve surgery includes preparing for gradual progress. Most patients lose 60–70% of excess weight within 12–18 months, but it takes continuous effort.
2. Address Mental Health
Part of the preparation for gastric sleeve involves meeting with psychologists or counsellors. This helps identify patterns like binge eating, anxiety, or depression, and ensures you’re emotionally ready. As suggested by the Better Health Channel, being open about your mental health supports better outcomes. In addition, with supportive guidance from Dr Monica, our habits coach, patients are better equipped to establish sustainable habits and approach their journey with a positive mindset.
3. Join a Support Network
Online and local support groups provide emotional encouragement, shared advice, and accountability. Surrounding yourself with people on similar paths helps normalise the journey and reduces feelings of isolation.We have our own personal online Bariatric Support Group on facebook only for Mr.Niruben’s Patients.
Physical Readiness: What to Do Before Gastric Sleeve Surgery
Physically preparing your body ensures a smoother surgical experience and faster recovery. If you're wondering how to prepare for gastric sleeve surgery, these are essential steps:
1. Stop Smoking
Smoking increases surgical risk and delays healing. Most Australian bariatric surgeons prefer patients to quit smoking at least four to six weeks before the operation.
2. Start Gentle Exercise
Incorporate light walking, stretching, or water-based activity into your routine. Exercise improves cardiovascular health, boosts mood, and aids post-op recovery.
3. Review Your Medications
Let your medical team know about all supplements and medications you’re taking. Some medications, like blood thinners or diabetic treatments, or weight loss injections, which may need to be adjusted before surgery.
Gastric Sleeve Preparation Diet
The most essential dietary task is following a gastric sleeve preparation diet, typically 1–4 weeks long. This pre-op gastric sleeve diet helps reduce fat around your liver and abdomen, making the surgery technically safer and faster.
Duration and Importance
Most patients are prescribed a 2-week pre-op gastric sleeve diet, although durations may vary depending on your BMI and health history. During this time, nutritional support from our dietitian Ms Steffania Basso can make a significant difference, helping tailor your intake to meet surgical requirements while ensuring you remain energised and well-nourished.
Components of the Diet
The gastric sleeve pre op diet usually consists of:
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Meal replacements: High-protein, low-carb shakes (like Optifast).
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Non-starchy vegetables: Leafy greens, broccoli, capsicum, and cauliflower.
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Plenty of fluids: At least 1.5–2 litres of water per day.
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No sugar or fats: These can hinder liver shrinkage and increase surgical risk.
Following the 2 week pre op diet for gastric sleeve requires discipline.
Planning and Logistics: Practical Preparation for Gastric Sleeve Surgery
In addition to dietary and mental preparations, there are practical things you’ll need to consider in the weeks leading up to surgery.
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Time off work: Most people require 1–4 weeks off to recover fully.
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Stock your home: Purchase soft foods, vitamins, and bariatric supplements.
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Organise transport: You'll need someone to accompany you home from the hospital.
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Pack your hospital bag: Include loose-fitting clothes, toiletries, ID, and a water bottle.
These tasks are simple but vital when planning what to do before gastric sleeve surgery.
The Day Before Surgery
Your surgical team will provide specific fasting guidelines. Most commonly, you’ll be asked to:
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Stop eating solid food 8–12 hours before surgery.
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Drink only clear fluids like broth, water, or sugar-free electrolyte drinks.
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Avoid alcohol, coffee, and fizzy drinks.
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Adhere strictly to instructions to avoid delays or cancellations.
This final phase is the conclusion of your gastric sleeve preparation diet and helps ready your digestive system for surgery.
What Comes After: Understanding the Post-Surgery Diet
Knowing what happens after gastric sleeve surgery can also help with how to prepare for gastric sleeve surgery. Your post-op eating will follow phases:
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Days 1–3: Clear fluids only.
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Weeks 1–2: Full fluids like shakes and broths.
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Weeks 3–4: Pureed foods.
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After Week 4: Gradual return to solids, starting with soft, high-protein meals.
The specialists and dietitians offer ongoing support throughout the transition period and are well-versed in all aspects of recovery following gastric sleeve surgery.
While following a proper diet is essential after gastric sleeve surgery, combining it with a suitable exercise routine after gastric sleeve surgery can support weight loss and improve overall health.
Why Choose Dr Niruben Rajasagaram?
Dr Niruben Rajasagaram provides advanced bariatric surgery with minimally invasive techniques, shorter recovery times, and a comprehensive follow-up plan covering diet, exercise, and medical monitoring. His expertise ensures lower complication rates and improved long-term health outcomes.
Alongside a skilled team, Dr Niruben provides a supportive, patient-focused experience from consultation to post-surgery care. Patients benefit from:
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Nutritional support from dietitian Ms Steffania Basso
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Behavioural guidance through the lifestyle coaching program led by Dr Monica Devanand
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A professional, caring reception team who assist throughout the journey
This multidisciplinary approach is designed to empower patients and support lasting, healthy change.
Take Away
Preparing for gastric sleeve surgery goes beyond physical readiness—it’s about emotional resilience, behavioural change, and nutritional education. Understanding how to mentally prepare for gastric sleeve surgery, sticking to the pre-op diet, and fulfilling all requirements for gastric sleeve surgery will maximise your chances of long-term success.
The process might seem overwhelming, but every step brings you closer to a healthier, more confident version of yourself. You are in good hands with support from Australian healthcare professionals, trusted resources, and Mr Niruben Rajasagaram leading the way.
Book a consultation today to assess your eligibility, discuss potential risks and benefits, and take a decisive step toward achieving sustainable weight loss and better health!
