Is gastric bypass better or sleeve? A bariatric surgeon’s answer with a detailed review of the pros and cons
According to Dr. Mohammad Taghi Rezaei, Endoscopic Surgery Fellowship (Laparoscopy) with medical system number 132361 and Official member of IFSO (International Federation of Bariatric Surgery and Metabolic Disorders) as one of the best bariatric surgery specialists in Tehran, he often faces the question that between Gastric sleeve operation and Gastric bypass surgery Which is better?
Based on Dr. Mohammad Taghi Rezaei’s clinical experience of more than 10 years in performing thousands of successful slimming surgeries and reviewing authoritative studies such as ASMBS (American Society of Metabolic and Bariatric Surgery) and IFSO Bariatric Surgery Association, there is no absolute better method. But which one is better and suitable for an obese patient based on his physical condition?
This article with the guidance of Dr. Mohammad Taghi Rezaei on the topic Gastric bypass or sleeve is better we pay First, get to know both bariatric surgery methods.
The difference between gastric sleeve and gastric bypass

Photo of the difference between sleeve and bypass from the website of Dr. Taghi Rezaei, a bariatric surgeon in Tehran.
What is gastric sleeve operation?
surgery Stomach sleeve (Gastric Sleeve) is a minimally invasive surgical procedure in which 80-85% of the stomach volume is removed and the remainder is transformed into a narrow tube (sleeve-like).
According to Dr. Rezaei, a gastric sleeve surgeon:
This procedure focuses on reducing the volume of food and the release of the hormone ghrelin (hunger hormone), without changing the intestinal tract. It is not possible to return the stomach and digestive system to the original state, and it is ideal for patients with volume overeating.
What is gastric bypass surgery?
Gastric bypass surgery (Gastric Bypass, Roux-en-Y type) is more complicated and involves creating a small pouch from the upper part of the stomach and connecting it directly to the small intestine.
According to Dr. Rezaei gastric bypass surgeon:
A part of the stomach and intestine is bypassed to reduce the volume of food and calorie absorption. In this method, it is possible to return to the pre-operative conditions if needed, and for patients with metabolic problems such as Type 2 diabetes It is more appropriate.
Table of differences between gastric bypass operation and gastric sleeve operation
| Stomach sleeve | Gastric bypass | Feature |
| Removal of 80% of the stomach (restrictive) | Creating a small stomach pouch and connecting to the intestine (combined) | How to act |
| 60 to 70 percent overweight | 80 to 90 percent overweight | The amount of weight loss |
| Less and simpler | More and more complicated | Complexity of action |
| Effective, mainly through weight loss | Very effective and fast, due to hormonal changes | Effect on type diabetes 2 |
| Shorter (about 1 hour) | Longer (between 1 and 1:30 hours) | operation time |
| Slower than bypass | Faster than a sleeve | Speed of weight loss |
| Acid reflux | Dumping syndrome, intestinal obstruction, ulcers | Main complications |
How to perform each action


Both procedures are mainly performed laparoscopically (with small incisions), but they have key differences:
sleeve operation: The surgery is simple and short-term (less than 1 hour). The surgeon removes most of the stomach and closes the edges with a stapler. With no bowel manipulation.
Bypass operation: It is longer (1-1:30 hours) and more technical. including dividing the stomach, creating a pouch and reconstructing the intestinal tract. The need for high expertise to prevent complications.
According to Dr. Mohammad Taghi Rezaei, a bariatric surgeon, obese patients should be familiar with the advantages and disadvantages of each method.
In Dr. Rezaei’s obesity treatment clinic, free consultation sessions are held for slimming surgery candidates, in which Dr. Rezaei fully explains all the advantages and disadvantages of each surgical method.
Advantages of gastric sleeve
Significant reduction in hunger due to removal of ghrelin source.
Maintaining the natural absorption of nutrients.
Stable weight loss (60-70% excess weight) with less risk of skin sagging.
Short surgery time.
Suitable for people who are only bulky eaters.
Benefits of gastric bypass
Faster weight loss (80-90% excess weight) due to limited absorption.
Superior improvement of related diseases such as reflux, diabetes and hypertension.
The ability to return to pre-operative conditions in certain cases.
Ideal for patients with severe reflux or picky eating. It is also possible for patients who are bulky eaters.
Disadvantages of gastric sleeve
The changes made are permanent and irreversible.
Risk of stapler leakage, infection or new reflux (complication rate about 2-3%).
Fewer long-term studies than bypass.
Disadvantages of gastric bypass
Complications different from SLI, such as dumping syndrome, the possibility of vitamin deficiency (resolved by taking supplements), intestinal obstruction or ulcers (5-10% rate).
Longer surgery time.
Endoscopy is more difficult after the operation.
Recovery period and diet
The diet after both surgeries is phased: liquids for the first week, then purees and soft foods, and finally low-volume solids. In gastric bypass and sleeve, vitamin supplements (such as B12 and iron) are necessary due to decreased absorption. They have the same recovery period. Light exercise is recommended from the second week, but heavy activity is prohibited for 2-3 months.
The suggestion of Dr. Mohammad Taghi Rezaei, the best bariatric surgeon in Tehran: sleeve or gastric bypass?


As an official member of IFSO (International Association of Bariatric Surgery), Dr. Mohammad Taghi Rezaei, advanced laparoscopy and bariatric and metabolic surgery superspecialist fellowship, offers and selects obesity treatment with bariatric surgery based on the conditions of each patient.
This choice is not based on a simple formula, but in Dr. Rezaei’s obesity treatment clinic, every person who is a bariatric surgery candidate must be selected based on the results of specialized tests. Gastric sleeve operation or Gastric bypass surgery It is better!
If I have any advice:
If the index patient BMI has averagethe comorbidity is milder, and he wants a simpler operation, without bowel manipulation, gastric sleeve is a good option provided he is only a bulky eater.
If the patient has index BMI uphave severe comorbidities (eg, uncontrolled diabetes, severe dyslipidemia), or have gastric reflux, gastric bypass may be a better choice.
In any case, the bariatric surgeon (Dr. Mohammad Taghi Rezaei) makes a joint decision with the patient.
But what is the BMI index? And how to get its number?
What is body mass index or bmi?


Body mass index (BMI) is a measure to evaluate the status of body weight in relation to height. Calculation formula: weight (kilograms) divided by the square of height (meters). Values: less than 18.5 thin, 18.5-24.9 normal, 25-29.9 overweight, over 30 obese.
This index helps to assess health, the risk of heart diseases, diabetes and blood pressure.
for Calculate bmi To the site of Dr. Mohammad Taghi Rezaei, a bariatric surgeon, at the following address:
Online calculation of BMI for women and men + body mass index interpretation table
refer to On this page, you can calculate the bmi of women online and calculate the bmi of men online quite simply and online.
Obesity treatment with the best bariatric surgery method by Dr. Mohammad Taghi Rezaei


If you are like many people, with excessive obesity Are you struggling and suffering from problems such as: constant fatigue, joint pain, breathing problems, diabetes, high blood pressure or even low self-confidence, know that you are not alone.
These challenges can make everyday life difficult, but the good news is that there are effective solutions.
Dr. Mohammad Taghi Rezaei, as a specialist in advanced laparoscopic surgery and bariatric surgery in Tehran, with rich experience in this field, chooses the best bariatric surgery method for you.
He is among the types of obesity surgeries such as: Gastric sleeve operation, Gastric bypass, Gastric mini bypass operation and Gastric bypass operation Based on your physical condition, medical history and goals, it will suggest the ideal option to achieve safe and lasting results.
To get a free bariatric surgery consultation and start the path of transformation of your life, go to the site of Dr. Mohammad Taghi Rezaei; The best bariatric surgeon in Tehran Refer to the address with more than 3 thousand successful bariatric surgeries.
Phone: 09353520305
Instagram: https://www.instagram.com/dr.rezaei.mt
We are with you step by step until you lose weight.
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