Bariatric Surgeries

Most patients spend months researching whether to have weight loss surgery. Very few spend that same time thinking about which procedure they should have — and that's often where things go wrong. The decision to have surgery and the decision about which surgery are two separate questions. Both matter.

What we see in practice is a predictable pattern. A patient comes in for a consultation, has a sleeve, and develops worsening acid reflux over the following two years. Or they have a high BMI and significant diabetes, get a sleeve because it was presented as the standard approach, and don't lose enough weight to see meaningful metabolic improvement. These aren't rare outcomes. They're what happens when the procedure doesn't match the patient.

The structural reality of bariatric surgery is this: what a surgeon recommends is largely shaped by what they offer. A practice that performs one or two procedures will recommend from that menu. A practice that offers the full spectrum — sleeve, bypass, SADI-S, duodenal switch, and revisional surgery — can recommend based on what actually fits the patient's situation. That difference is worth understanding before you choose a surgeon.

The GERD and Sleeve Problem

Sleeve gastrectomy removes roughly 80% of the stomach, including the fundus — the upper curved portion. The fundus contains muscle fibers that help keep the lower esophageal sphincter closed. When those fibers are removed, the sphincter loses some of its anti-reflux support. The reshaped stomach also generates higher internal pressure. The result: acid has an easier path upward, and patients with pre-existing reflux often find it gets significantly worse.

This isn't a rare complication. Research published in the Annals of Surgery found that de novo gastroesophageal reflux disease (GERD) — new-onset reflux that wasn't present before surgery — developed in roughly 25% of sleeve patients at five years. Pre-existing GERD worsened in about 37%. A subsequent meta-analysis published in Obesity Surgery in 2022 reported new-onset GERD in 19–34% of sleeve patients at five years, with 8–12% eventually requiring revision to gastric bypass for reflux that couldn't be managed any other way.

Barrett's esophagus — a condition where chronic acid exposure causes changes to the esophageal lining — is a contraindication to sleeve. So is a large hiatal hernia. These patients need bypass, not sleeve. Bypass works differently: the stomach is divided and connected to a section of intestine further down, which effectively diverts bile and acid away from the esophagus. A systematic review and meta-analysis published in Surgical Endoscopy in 2021 found GERD resolution in 72% of bypass patients at two years, compared to 28% of sleeve patients.

When we evaluate a patient for a procedure consultation, reflux history is one of the first things we look at. If a patient has documented GERD and wants a sleeve, we tell them directly: the sleeve will make your reflux worse. If someone comes in with Barrett's esophagus, bypass is the correct procedure. That's not a close call. The reason patients end up with the wrong answer is that many practices don't have that conversation — either because bypass isn't on the menu, or because sleeve is presented as the default.

Choosing sleeve when bypass is indicated doesn't just produce worse reflux outcomes. It sets up a more complicated situation down the road. Revising a sleeve to bypass is technically more difficult than performing bypass as a primary operation. The complication rate for revisional surgery runs roughly three times that of primary procedures. Getting the right procedure the first time matters.

Learn more about how we approach each option: Sleeve Gastrectomy and Roux-en-Y Gastric Bypass.

High BMI and the SADI-S Question

For patients with a BMI above 50, or for patients with severe, poorly controlled type 2 diabetes, sleeve gastrectomy frequently produces insufficient weight loss and limited metabolic improvement. These patients need a procedure that includes malabsorption — meaning the surgery causes the body to absorb fewer calories from food by rerouting where digestion happens. Sleeve restricts how much you eat. It doesn't change how you absorb what you eat. For certain patients, restriction alone isn't enough.

The question then becomes which malabsorptive procedure. SADI-S — single anastomosis duodenal-ileal bypass with sleeve — is one of the most effective procedures for patients in this category. It combines a sleeve-shaped stomach with a single surgical connection (anastomosis) that reroutes food past a significant length of small intestine, reducing caloric absorption. A 2025 network meta-analysis published in Obesity Surgery found excess weight loss of 85–95% at one to two years and type 2 diabetes remission in 92% of SADI-S patients. That diabetes remission figure is meaningfully higher than what bypass produces — approximately 75% — and substantially higher than sleeve at roughly 60%.

SADI-S produces outcomes comparable to traditional duodenal switch with a simpler anatomy. Traditional duodenal switch requires two surgical connections; SADI-S requires one. Fewer connections means lower surgical complexity and lower complication risk. A 2025 head-to-head study published in Surgery for Obesity and Related Diseases found ten-year total weight loss essentially equal between the two — 47% for SADI-S versus 46% for traditional duodenal switch — but significantly lower rates of malnutrition with SADI-S.

Here's the problem: most surgeons performing bariatric procedures don't offer SADI-S. The procedure requires specific fellowship training and ongoing case volume. The American Society for Metabolic and Bariatric Surgery approved SADI-S for both primary and revisional use in 2024, and the organization indicates that surgeons should have completed fellowship training or performed at least 25 prior cases before offering it independently. Very few community bariatric programs meet that bar. A patient who needs malabsorption and goes to a surgeon who doesn't perform SADI-S will be offered something from a shorter list — often bypass or traditional duodenal switch — without ever learning that SADI-S was an option.

Dr. Brown is a national proctor for SADI-S. That means she trains other surgeons in the procedure. She performs SADI-S as both a primary operation and as a revision for patients whose prior procedures didn't produce sufficient results. If you're in the high-BMI or severe-diabetes category, SADI-S should be part of your conversation. Learn more about SADI-S.

When Bypass Is the Right Malabsorptive Option — and When It Isn't

Bypass is a well-established procedure with strong long-term data. For patients with significant GERD, Barrett's esophagus, or a large hiatal hernia who also need more than restriction alone, bypass is typically the correct answer. It resolves acid reflux while producing meaningful metabolic outcomes — roughly 75% type 2 diabetes remission at two years in the literature.

But for patients without significant reflux who need a malabsorptive procedure, SADI-S is worth a direct comparison. The two procedures have different anatomy, different long-term nutritional profiles, and different revision options if something goes wrong later. We recommend bypass over SADI-S when reflux is part of the picture — SADI-S preserves the pylorus, which means it doesn't address acid the way bypass does. That distinction is clinically important. A patient with both severe diabetes and documented GERD gets bypass. A patient with severe diabetes and no significant reflux history is a candidate for SADI-S, and we discuss both options before any decision is made.

A surgeon who only performs bypass as a malabsorptive option can't have that conversation. They can tell you what bypass does — they can't tell you how it compares to a procedure they don't offer.

Choosing the Right Procedure — A Clinical Framework

Sleeve gastrectomy is appropriate for patients without significant reflux, without Barrett's esophagus, and with a BMI generally under 50 who don't have severe uncontrolled diabetes. It's a well-tolerated restrictive procedure with solid five-year weight loss data in the right patient. It is not appropriate for patients with documented GERD, large hiatal hernia, or Barrett's esophagus — in those patients, it reliably makes reflux worse.

Roux-en-Y gastric bypass is the preferred option for patients with significant reflux, Barrett's esophagus, or hiatal hernia who need a surgical weight loss procedure. It also performs well for patients with type 2 diabetes who need malabsorption but have reflux as a complicating factor. The procedure involves creating a small gastric pouch and connecting it directly to the small intestine, which bypasses the stomach and reroutes bile away from the esophagus.

SADI-S is the procedure we recommend for patients with BMI above 50, severe uncontrolled type 2 diabetes, or patients who have failed a prior restrictive procedure and need malabsorption. It produces the strongest metabolic outcomes in the literature and has a simpler anatomy than traditional duodenal switch. Because it requires specific training to perform safely, it isn't available at most bariatric programs. Dr. Brown is a national proctor for this procedure.

Duodenal switch is the most aggressive malabsorptive procedure we offer. It involves two surgical connections and produces the highest degree of malabsorption of any bariatric procedure. We consider it for patients with BMI above 60 where maximum malabsorption is needed, or in specific anatomical situations where SADI-S isn't the right fit. Long-term nutritional monitoring is more intensive with traditional duodenal switch than with SADI-S.

Revisional bariatric surgery addresses outcomes that didn't go as planned after a prior procedure — inadequate weight loss, weight regain, worsening reflux after sleeve, or anatomical problems that developed over time. Revision carries higher technical complexity and higher complication risk than primary surgery, which is why choosing the right procedure the first time matters. We perform revisions from sleeve to bypass, sleeve to SADI-S, band removal to sleeve or bypass, and other conversions based on what the patient's anatomy and clinical picture require.

Lap band removal is increasingly common as patients who had bands placed in the 2000s and early 2010s seek to have them removed due to complications, erosion, dysphagia, or simple failure to maintain results. Removal alone is an option, but most patients choose to convert to a sleeve or bypass at the same time or in a staged approach. We review each case individually to determine whether single-stage conversion is the right plan.