The Benefits of Weight Loss Before Bariatric Surgery

The Benefits of Weight Loss Before Bariatric Surgery - Bariatric Fusion
weight loss benefits before surgery

Current research has shed new light on the importance of weight loss before undergoing bariatric surgery. Preoperative weight loss has demonstrated significant long-term and short-term outcomes, including decreased mortality rate within 30 days after surgery, reduction in liver volume, shorter hospital stays, increased postoperative weight loss, shorter operating times, and decreased adipose tissue in the body. (1,2,3)

Enhanced Recovery After Bariatric Surgery (ERABS)

Studies have shown that even a moderate degree of preoperative weight loss (>0% to <5%) can significantly lower the risk of 30-day mortality following bariatric surgery. (1) Under the guidance of a bariatric healthcare team, preoperative weight loss has led to improved postoperative outcomes, reduced mortality rates, and better control of hyperglycemia during the hospital stay. (1) Findings indicate that even a small reduction in weight before surgery can decrease the odds of 30-day mortality following bariatric surgery by 24%. (1)

Further research conducted over a 12-week period involved individuals following a very low-energy diet (456-680 kcal/day) under the observation of registered dietitians and healthcare professionals. (2) This diet included meal replacement shakes, low-starch vegetables, vitamin and mineral supplements, approximately 2 liters of calorie-free beverages per day, and physical activity.

The study provided valuable insights into the short-term and long-term benefits of weight loss before bariatric surgery. Preoperative weight loss tracked over 12 weeks resulted in a reduction of adipose tissue and provided a head start on adopting a healthier lifestyle, leading to improved adherence after bariatric surgery. Short-term benefits of weight loss within a 2-week period included reduced liver size, decreasing the risk of complications and facilitating better access to the stomach during the surgical procedure. (2) To maintain lean muscle mass and support fat burning, a high protein intake, in addition to a very low-calorie diet, has been utilized preoperatively. This approach also helps bariatric patients become familiar with the concept of high protein intake after surgery (60-80 g/day).

Liver Reduction Diet

Reducing the size of the liver can significantly impact surgical complexity. Nonalcoholic Fatty Liver Disease (NAFLD) is prevalent in one-third of individuals who are severely obese (BMI >35). (2) This condition involves excessive fat accumulation in the liver cells, increasing the surgical risk for patients undergoing bariatric surgery. While the most appropriate treatment option for NAFLD is yet to be determined, weight reduction remains the primary focus in managing NAFLD associated with obesity. (2)


Taking current research into account, Bariatric Fusion continues to offer a liver reduction program two weeks before surgery. This program involves a high protein, low-calorie diet achieved by consuming Bariatric Fusion high protein meal replacement shakes, which promote weight loss and reduce liver size. The program can be customized based on recommendations from the bariatric healthcare team. The preoperative use of Bariatric Fusion high protein, low-calorie meal replacements also helps patients transition into using the product postoperatively, ensuring adequate protein intake, maintaining lean body mass, and supporting healing.

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1. JAMA Netw Open. 2020; 3(5):e204803 [PMID: 32407504]

2. Am J Clin Nutr. 2006; 84(2):304-11 [PMID: 16895876]

3. J Am Coll Surg. 2018; 226(4):514-524 [PMID: 29402531]

*These statements have not been evaluated by the Food & Drug Administration (FDA). These products are not intended to diagnose, treat, cure, or prevent any disease.

This blog is for information and education purposes only. This information is not intended to substitute professional medical advice, diagnosis, or treatment. Please consult with your bariatric surgeon or another qualified healthcare provider with any questions in regards to a medical condition. A qualified healthcare professional can best assist you in deciding whether a dietary supplement is suitable based on your individual needs.

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