Gastric Sleeve Surgery in Darien & Bolingbrook, IL
Medically reviewed by Sofiane El Djouzi, MD, FACSUpdated October 2026
A gastric sleeve removes about 80% of your stomach, so you feel full on less food and less hungry between meals. I perform it robotically through a few small incisions, usually with one night in the hospital. Adults with a BMI of 35 or higher qualify, and so do many with a BMI of 30 to 34.9 who have type 2 diabetes or another weight-related condition. In long-term trials, patients kept off about half of their excess weight five years later, and most saw diabetes, blood pressure and sleep apnea improve.1,2
What a gastric sleeve does
The full name is vertical sleeve gastrectomy. I remove the large, stretchy outer part of your stomach and leave a narrow tube about the size of a banana. Nothing is rerouted. Food still travels the same path it always did, just through a much smaller stomach.
Two things change. First, the new stomach holds only a few ounces, so a small meal fills you up. Second, the part of the stomach I remove is where most of the hunger hormone ghrelin is made. Most of my patients tell me their appetite is noticeably quieter within days.3
The sleeve is now the most common weight-loss operation in the United States, though bypass numbers have been rising over the past five years. It is simpler and shorter than a gastric bypass, with no new connections. The trade-off: it is permanent, and it can worsen acid reflux in some people.
If you want every question answered in detail, from the pre-op diet to loose skin, our gastric sleeve FAQ page goes deeper. This page is the overview.
How I perform the robotic sleeve
Nearly every sleeve I do is robotic. I sit at a console a few feet from you and control instruments that bend and rotate like a wrist, with a magnified 3D view inside your abdomen. The robot never moves on its own. It translates my hand movements into smaller, steadier ones. Once you are asleep under general anesthesia:
- Small incisions. I make four incisions, each under half an inch, and inflate the abdomen with carbon dioxide gas so I have room to work.
- Free the stomach. I separate the outer curve of the stomach from the tissue and blood vessels that hold it in place.
- Size the new stomach. A sizing tube goes down through the mouth and rests along the inner curve of the stomach. It acts as a guide so the sleeve is the right width from top to bottom.
- Staple and remove. I divide the stomach along the tube with a stapler that cuts and seals in one pass. The removed portion, about 80% of the stomach, comes out through one of the incisions.
- Check the work with a scope. At the end of the operation, while you are still asleep, I pass an endoscope down into the new stomach. I check that there is no bleeding inside, that the sleeve has an even width along its whole length with no twist or kink, and that any hiatal hernia repair sits correctly. Finally I fill the sleeve with air and watch the staple line for leaks. In my own practice I have not had a staple-line leak in the past ten years.
- Close and wake up. The incisions are closed with dissolvable stitches. Most patients are walking the halls within a few hours.
The operation usually takes about an hour and a half. You go home the next morning in most cases. Surgery takes place at University of Chicago AdventHealth Bolingbrook Hospital, an MBSAQIP-accredited bariatric center recognized as a Blue Distinction Center and center of excellence for bariatric surgery.
Who is a candidate for the sleeve
In 2022 the American Society for Metabolic and Bariatric Surgery (ASMBS) and its international partner IFSO updated the rules that had stood since 1991. The thresholds are lower than most people expect.4
- BMI of 35 or higher, whether or not you have any other health condition.
- BMI of 30 to 34.9 if you have type 2 diabetes or another metabolic disease, or if diet, exercise and medication have not produced lasting results.
- BMI of 27.5 or higher for patients of Asian descent, because health risks start at a lower BMI.
- Ready to change how you eat for good, and willing to come back for follow-up visits.
Not sure of your BMI? Our 60-second candidate quiz works it out and tells you where you stand. There is also a sleeve-specific version if you already have the sleeve in mind.
When I steer patients toward a different operation
The sleeve is the right choice for most people, but not for everyone. If you have severe acid reflux that medication does not control, or a condition called Barrett's esophagus, the sleeve can make it worse, and I will usually recommend a bypass instead.2 If you have type 2 diabetes that is hard to control, or a BMI above 50, the bypass or a SADI-S may give you more. We work through this together at your consultation, and insurance plans sometimes have their own rules. The insurance page explains what carriers look for.
What results to expect
Surgeons measure results as a share of your excess weight, meaning the pounds above a healthy weight for your height. If you are 100 pounds over, losing 55% of your excess weight means losing about 55 pounds. Most of the loss happens in the first 12 to 18 months.
Two randomized trials followed sleeve patients for five years. In the Finnish SLEEVEPASS trial, sleeve patients had lost 49% of their excess weight at five years. In the Swiss SM-BOSS trial, they had lost 61% of their excess BMI.1,2 At ten years, SLEEVEPASS patients were still down 43.5% of their excess weight, with a wide range from person to person.5 A large review of earlier studies across all bariatric operations found an average excess weight loss of 61%.6 In my own practice, patients typically lose 60 to 70% of their excess weight. Some lose much more, and a few lose less. Your eating habits and follow-up visits matter as much as the operation.
Health changes, not just pounds
The weight loss is the visible part. The health changes are why I do this work.
- Type 2 diabetes. In a U.S. study of 9,710 patients with diabetes, 84% of sleeve patients reached remission at some point in the five years after surgery, and about four in ten of those saw it return within five years.16 In SLEEVEPASS, 37% of sleeve patients with diabetes were in full or partial remission at five years.1 In the STAMPEDE trial, sleeve patients cut their average A1c far more than patients on intensive medication alone, and used far less insulin.7
- Blood pressure and cholesterol. Across bariatric procedures, high blood pressure resolved in about 62% of patients and improved in 79%. Cholesterol problems improved in 70% or more.6
- Sleep apnea. Resolved in roughly 86% of patients in the same review.6 Many of my patients retire their CPAP machine within a year.
- Living longer. The Swedish Obese Subjects study followed more than 4,000 people for over a decade. Those who had bariatric surgery had a 29% lower risk of death from any cause than matched patients who did not.8
Want a projection built on your own numbers? Try the weight-loss calculator.
Risks, and how we lower them
Every operation carries risk, and I would rather you hear it from me than from a forum. The sleeve is one of the safest major operations performed today. The ASMBS puts the risk of death at about 0.1%, and the risk of a major complication at about 4%.9 A 2020 review in JAMA reported death rates between 0.03% and 0.2% for modern bariatric surgery.10 Here is what we watch for and what we do about it.
Staple-line leak
Rare but serious. I test the staple line before closing, and you are taught the warning signs (fever, fast heart rate, worsening pain) before you go home.
Bleeding and blood clots
You walk within hours of surgery, wear compression devices on your legs, and receive a blood thinner while in the hospital. Patients with a BMI above 50, limited mobility, a previous DVT or pulmonary embolism, or a strong family history of clots go home on a blood thinner for a defined period that depends on their situation.
Acid reflux
In the SM-BOSS trial, reflux got worse in about 32% of sleeve patients versus 6% after bypass.2 That is why every bariatric patient in my practice has an upper endoscopy before surgery. It lets me examine the esophagus, stomach and upper small intestine for anything that affects surgical safety. For sleeve candidates it matters most for finding significant reflux or a hiatal hernia, which may change which operation I recommend. When medication stops controlling reflux after a sleeve, conversion to a bypass is the usual fix.
Barrett's esophagus
Years of reflux can change the lining of the esophagus. Studies that scoped sleeve patients found Barrett's in about 12% of them, often without symptoms.11 We recommend a surveillance endoscopy three years after the sleeve, then every five years.
Vitamin deficiencies
Less common than after a bypass, but real. You take a bariatric multivitamin, B12, calcium and vitamin D, and we check your blood work on a schedule based on ASMBS guidelines.12
Stricture or narrowing
Uncommon. If the sleeve narrows and food has trouble passing, it can usually be stretched with an endoscope, without another operation.
Where you have surgery matters too. MBSAQIP accreditation means the hospital meets national standards for staffing, equipment and outcomes tracking, and insurers increasingly require it.13
Your recovery timeline
Recovery from a robotic sleeve is faster than most patients expect. Here is the protocol I use. Yours may differ a little, and we adjust it to you.
- Day of surgeryYou wake up in recovery, start sipping water, and take your first walk within a few hours.
- Day 1Home the next day, walking on your own and managing stairs. Pain is usually controlled with Tylenol. Week 1 is liquids only.
- First few daysYou can drive once you are off narcotic pain medication, usually within a few days.
- Week 1Most patients are back to work within one week. Lift nothing heavier than 10 pounds for the first 14 days.
- Week 2Puréed, smooth-consistency foods. After two weeks you gradually return to normal physical activity, and to full work duties once cleared.
- Weeks 3 to 6Soft, easy-to-digest foods. Your six-week follow-up visit, where we review your eating, your vitamins and your incisions.
- Week 7 onwardGradual return to solid foods as tolerated, guided by our dietitian and team.
- First year and beyondFollow-up visits with our team and dietitian through the first year, plus blood work. The ASMBS recommends a yearly bariatric visit for life, and so do I.14
Our post-surgery instructions page has the day-by-day diet and activity guide you will follow.
Insurance and self-pay
Most major plans cover the gastric sleeve when you meet their criteria, including Blue Cross Blue Shield of Illinois, Aetna, Cigna, UnitedHealthcare, Tricare and Medicare. Our team verifies your benefits before your first visit, at no cost, and handles the pre-authorization paperwork. If you are paying out of pocket, we offer a flat self-pay package and medical financing. Details are on the insurance and financing page, and our self-pay prices are published, with what each package includes.
Sleeve or bypass?
The sleeve is simpler, with no rerouting and a lower risk of vitamin deficiency. The bypass usually produces a little more weight loss, does more for type 2 diabetes, and is the better operation if you have reflux. Our sleeve vs. bypass comparison walks through the differences and includes a quick quiz. You can also see every procedure side by side.
Questions patients ask me about the sleeve
Will I still feel hungry after a sleeve?
Much less, especially in the first year. Removing the upper stomach removes most of the cells that make ghrelin, the hormone that drives hunger. Some appetite returns over time, which is normal. Protein-first meals and regular follow-up keep it in check.
Why do you do the sleeve robotically instead of laparoscopically?
Both are minimally invasive. The robot gives me a magnified 3D view and instruments that turn like a wrist, which helps with precise stapling and suturing, especially in patients with a higher BMI or prior surgery. National registry data show that outcomes for robotic bariatric surgery have been improving year over year and are comparable to laparoscopic surgery.15
I have heartburn now. Can I still get a sleeve?
Sometimes. Mild, occasional heartburn is not a deal-breaker. Daily reflux, a large hiatal hernia or Barrett's esophagus usually point me toward a bypass. Your pre-op endoscopy shows me exactly what is there before we decide, and I repair a hiatal hernia at the time of surgery if one is found.
Can I have a sleeve if I have had other abdominal surgery?
Usually, yes. Scar tissue from a C-section, gallbladder removal or hernia repair can make the operation more involved, but it rarely rules it out. This is one place where the robot's precision helps. Bring your old operative reports to your consultation if you have them.
Is the sleeve safe if I am over 60?
Age alone is not a barrier. I look at your heart, lungs, kidneys and how active you are. Older patients often gain the most from getting off diabetes and blood-pressure medication, and the sleeve's shorter operating time makes it a common choice in this age group.
How soon after my consultation can I have surgery?
It depends on your insurer and your policy. In the best case, approval takes a few days and surgery can be scheduled within the following two weeks. Some plans require a medically supervised weight-loss program of three to six months first. Our team reviews your plan’s requirements and guides each step to avoid delays. Self-pay patients can often be scheduled within a couple of weeks once their testing is complete.
Patient reviews
What do patients say about their gastric sleeve?
I couldn't ask for a better doctor. I've been blessed. My sleeve surgery went flawlessly, I haven't had any issues. Dr Djouzi is amazing, very caring and thoughtful. He really cares about your well being before, during and after surgery.
★★★★★
Erika, Google review, 2025
Dr.El Djouzi is a very knowledgeable physician that takes his time in explaining important concepts of surgery to all his patients. He is respectful and helps patients feel comfortable when going through a major event like surgery. His pre op and post op care is phenomenal and helps patients stay on track of their weight loss. As a surgeon he is very skilled and it is apparent he has a lot of experience doing both a gastric sleeve and bypass surgeries.
★★★★★
Breeyana, Google review, 2026
Life-changing care and incredible robotic surgery expertise! I cannot say enough good things about Dr. El Djouzi and the phenomenal team at Premier Bariatric Institute. From day one, the level of care and personal attention I received was unmatched. Dr. El Djouzi performed my robotic surgery, and his skill is truly second to none.
★★★★★
Yasir, Google review, 2026
From my first meeting with Dr ElDjouzi I got the impression that he was as invested in my health as I was. I had been looking into weight loss surgery for some time but never pulled the trigger on it.
★★★★★
Mindi, Google review, 2022
These are public Google reviews, shown with first names only. Read all reviews on Google.
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Sources
- Salminen P, et al. Effect of laparoscopic sleeve gastrectomy vs laparoscopic Roux-en-Y gastric bypass on weight loss at 5 years: the SLEEVEPASS randomized clinical trial. JAMA. 2018;319(3):241-254. PubMed
- Peterli R, et al. Effect of laparoscopic sleeve gastrectomy vs laparoscopic Roux-en-Y gastric bypass on weight loss in patients with morbid obesity: the SM-BOSS randomized clinical trial. JAMA. 2018;319(3):255-265. PubMed
- American Society for Metabolic and Bariatric Surgery. Bariatric Surgery Procedures. asmbs.org
- Eisenberg D, et al. 2022 ASMBS and IFSO indications for metabolic and bariatric surgery. Surg Obes Relat Dis. 2022;18(12):1345-1356. DOI
- Salminen P, et al. Effect of laparoscopic sleeve gastrectomy vs Roux-en-Y gastric bypass on weight loss, comorbidities, and reflux at 10 years: the SLEEVEPASS randomized clinical trial. JAMA Surg. 2022;157(8):656-666. PubMed
- Buchwald H, et al. Bariatric surgery: a systematic review and meta-analysis. JAMA. 2004;292(14):1724-1737. PubMed
- Schauer PR, et al. Bariatric surgery versus intensive medical therapy for diabetes: 5-year outcomes (STAMPEDE). N Engl J Med. 2017;376(7):641-651. PubMed
- Sjöström L, et al. Effects of bariatric surgery on mortality in Swedish obese subjects. N Engl J Med. 2007;357(8):741-752. PubMed
- American Society for Metabolic and Bariatric Surgery. Metabolic and Bariatric Surgery fact sheet. asmbs.org
- Arterburn DE, et al. Benefits and risks of bariatric surgery in adults: a review. JAMA. 2020;324(9):879-887. PubMed
- Qumseya BJ, et al. Barrett's esophagus after sleeve gastrectomy: a systematic review and meta-analysis. Gastrointest Endosc. 2021;93(2):343-352. PubMed
- Parrott J, et al. ASMBS integrated health nutritional guidelines for the surgical weight loss patient, 2016 update: micronutrients. Surg Obes Relat Dis. 2017;13(5):727-741. DOI
- American Society for Metabolic and Bariatric Surgery. Is Metabolic and Bariatric Surgery Right for You? asmbs.org
- American Society for Metabolic and Bariatric Surgery. Life After Bariatric Surgery. asmbs.org
- Pastrana M, et al. Evolution of outcomes of robotic bariatric surgery: first report based on MBSAQIP database. Surg Obes Relat Dis. 2020;16(7):916-922. PubMed
- McTigue KM, et al. Comparing the 5-year diabetes outcomes of sleeve gastrectomy and gastric bypass: the National Patient-Centered Clinical Research Network (PCORNet) Bariatric Study. JAMA Surg. 2020;155(5):e200087. PubMed
This page is general information, not medical advice. Results vary from person to person. Talk with Dr. El Djouzi about what to expect in your case.