Weight Loss Surgery Before and After​

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Expected Weight Loss from Gastric Sleeve and Gastric Bypass Surgeries

Weight loss surgery, particularly Gastric Sleeve and Gastric Bypass, has become a cornerstone in the battle against obesity in Australia. These bariatric procedures not only aim to facilitate significant weight loss but also improve overall health and quality of life. However, the extent of weight loss varies, influenced by the type of surgery, individual lifestyle, and adherence to post-operative guidelines.

Gastric Sleeve: The Often Recommended Choice

Gastric Sleeve (Sleeve Gastrectomy): This procedure involves removing about 80% of the stomach, leaving a tube- or sleeve-shaped stomach. It is increasingly recommended due to its balance of effectiveness and safety. Patients typically lose 50-75% of their excess weight within two years post-surgery. The Gastric Sleeve is favored for its fewer complications compared to other bariatric surgeries and its effectiveness in achieving substantial weight loss.

Gastric Bypass: A Proven Option for Significant Weight Loss

Gastric Bypass (Roux-en-Y): This is a well-established weight loss surgery that creates a small pouch from the stomach and connects it directly to the small intestine. Patients undergoing Gastric Bypass can expect to lose 55-80% of their excess body weight within the first two years. This procedure is particularly effective for individuals with severe obesity or related health conditions. Gastric bypass is more invasive and slightly riskier more than gastric sleeve.

Factors Influencing Weight Loss

Pre-Surgery Weight: Those with higher initial weights might lose more kg overall, but potentially a smaller percentage of their excess weight.

Diet and Lifestyle: Success in weight loss is significantly influenced by adherence to dietary guidelines, regular exercise, and overall lifestyle changes post-surgery.

Individual Health Factors: Age, metabolism, and other health conditions can impact the rate and extent of weight loss.

Long-Term Considerations

Both Gastric Sleeve and Gastric Bypass surgeries require a lifelong commitment to maintaining a healthy lifestyle. This includes a balanced diet, regular physical activity, and ongoing medical follow-ups. Patients may also need to take lifelong supplements due to altered nutrient absorption.



Gastric Sleeve and Gastric Bypass surgeries are effective tools for managing severe obesity. While the Gastric Sleeve is often recommended for its lower complication rate and effective weight loss, Gastric Bypass remains a viable option for those needing more significant weight reduction. It’s important for individuals to have realistic expectations and understand that these surgeries are part of a comprehensive approach to a healthier lifestyle. Consulting with healthcare professionals is essential to determine the most suitable option based on individual health profiles and weight loss goals.


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