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Author: Dr. Luis Pasten
Date: August 29, 2023

Gastric Sleeve vs Gastric Bypass Surgery: Discover Which Option Is Right for You!

Gastric Sleeve vs Gastric Bypass Surgery: Discover Which Option Is Right for You!

If you or someone you know is considering weight loss surgery, you’ve probably come across the terms Gastric Sleeve and Gastric Bypass. Both procedures are effective bariatric surgery options, but they involve different techniques and yield distinct results. Understanding the differences between the two can help patients make an informed decision about which procedure is best suited for their needs. 

Video explanation on TikTok @drluispasten

The Procedures: 

Gastric Sleeve (Sleeve Gastrectomy): 

  • This involves removing about 70-80% of the stomach. The result is a banana-shaped "sleeve" that connects the esophagus to the small intestines. This procedure does not involve any rerouting of the intestines.
  • By reducing the size of the stomach, the procedure limits the amount of food one can consume. 

Gastric Bypass (Roux-en-Y Gastric Bypass):

  •  This procedure involves creating a small pouch from the stomach's top part and connecting it directly to the small intestine, bypassing a significant part of the stomach and the first section of the small intestines.
  • Gastric bypass not only reduces stomach size but also alters the path of food, leading to changes in gut hormones and how the body absorbs calories and nutrients. 

Weight Loss Expectations:

  • Gastric Sleeve:  Patients can expect to lose 50-60% of their excess weight in the first 6 months post-surgery.
  • Gastric Bypass: Typically, this results in slightly higher weight loss numbers, with patients losing approximately 60-80% of their excess weight within the first 6 months. 

Nutritional Impact:

  • Gastric Sleeve: Nutrient absorption remains relatively normal since the intestines aren't rerouted. However, due to the reduced food intake, patients may need some vitamin and mineral supplementation.
  • Gastric Bypass: Since this procedure bypasses a portion of the small intestine, there’s a higher risk of nutrient deficiencies. Regular monitoring and lifelong vitamin and mineral supplementation are usually required. 

Recovery Time and Risks:

  • Gastric Sleeve: The procedure typically involves a shorter surgery time and slightly reduced risk when compared to gastric bypass. Most patients can return to normal activities within 2–4 weeks.
  • Gastric Bypass: Recovery might take a bit longer, and there’s a slightly increased risk of complications such as dumping syndrome, which can lead to nausea, flushing, and dizziness. 


  • Gastric Sleeve: This procedure is irreversible, since a portion of the stomach is permanently removed.
  • Gastric Bypass: Although technically reversible, reverting to the original anatomy can be complicated and is rarely done. 

Coexisting Health Conditions:

Both surgeries can lead to significant improvements or even resolution of obesity-related health conditions like type 2 diabetes, hypertension, and sleep apnea. However, some studies suggest that gastric bypass may have a slight edge in terms of rapid improvement in diabetes. 


Both gastric sleeve and gastric bypass are effective weight loss surgeries, each with its own set of advantages and challenges. When choosing the best option, it’s essential to consider individual health conditions, weight loss goals, and potential risks. If you want to know which procedure suits better to your personal circumstances, We invite you to fill out our medical questionnaire, or you can schedule a free consultation to get an evaluation. 

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