SADI-S & Duodenal Switch Surgery
Advanced Bariatric Surgery for Patients Who Need Greater Weight Loss
SADI-S and the traditional Duodenal Switch (DS) are advanced bariatric procedures designed for patients with severe obesity or obesity-related medical conditions. They combine a sleeve gastrectomy with an intestinal bypass to produce substantial weight loss and significant metabolic improvements—with a lifelong commitment to vitamin supplementation, adequate protein intake, and regular follow-up.
What Is SADI-S?
SADI-S stands for Single Anastomosis Duodeno-Ileal Bypass with Sleeve Gastrectomy. It combines:
- Sleeve gastrectomy — removes approximately 75–80% of the stomach
- Intestinal bypass — food bypasses part of the small intestine before mixing with digestive enzymes
The operation works through:
- You feel full after eating smaller meals
- Hunger and food cravings are reduced through hormonal changes
- Fewer calories and fats are absorbed
- Blood sugar metabolism improves significantly
What Is the Traditional Duodenal Switch?
The traditional Duodenal Switch (DS) also combines sleeve gastrectomy with intestinal bypass, but uses two intestinal connections (anastomoses) whereas SADI-S uses one. Both provide excellent weight loss and metabolic benefits. SADI-S was developed as a simplified modification while maintaining many advantages.
SADI-S vs. Traditional Duodenal Switch
| Feature | SADI-S | Traditional Duodenal Switch |
|---|---|---|
| Sleeve gastrectomy | ✔ | ✔ |
| Intestinal bypass | ✔ | ✔ |
| Number of intestinal connections | One | Two |
| Weight loss | Excellent | Excellent |
| Diabetes improvement | Excellent | Excellent |
| Lifelong vitamins | Required | Required |
| Lifelong laboratory monitoring | Required | Required |
How Does SADI-S Work?
Smaller Stomach
Removing most of the stomach allows you to feel full with much smaller portions.
Reduced Hunger
The portion of the stomach that produces ghrelin is removed during sleeve gastrectomy.
Changes in Digestion
Food bypasses part of the small intestine, reducing absorption of calories—particularly fat.
Metabolic Benefits
Many patients with type 2 diabetes experience significant improvement or remission.
Who May Benefit From SADI-S?
- Have a BMI of 50 or greater
- Have severe obesity with obesity-related medical conditions
- Have poorly controlled type 2 diabetes
- Need greater weight loss than may be achieved with other procedures
- Have regained weight after previous bariatric surgery
- Are committed to lifelong follow-up and vitamin supplementation
Benefits of SADI-S
- ✔Greater long-term weight loss
- ✔Significant improvement or remission of type 2 diabetes
- ✔Improvement in high blood pressure
- ✔Improvement in obstructive sleep apnea
- ✔Improvement in fatty liver disease
- ✔Better cholesterol levels
- ✔Less joint pain
- ✔Increased mobility and quality of life
Considerations Before Choosing SADI-S
- Take bariatric vitamin supplements every day
- Consume adequate protein daily
- Have routine blood work throughout life
- Attend regular follow-up visits
- Follow long-term nutrition recommendations
Possible Risks
- Vitamin and mineral deficiencies
- Protein deficiency
- Loose stools or diarrhea
- Increased gas or bowel movement frequency
- Dehydration
- Bowel obstruction
- Bleeding, infection, blood clots
- Leak from the staple line or intestinal connection
Which Bariatric Procedure Is Right for Me?
| Sleeve | Bypass | SADI-S | |
|---|---|---|---|
| Weight loss | ⭐⭐⭐⭐ | ⭐⭐⭐⭐ | ⭐⭐⭐⭐⭐ |
| Diabetes improvement | ⭐⭐⭐ | ⭐⭐⭐⭐⭐ | ⭐⭐⭐⭐⭐ |
| GERD improvement | ⭐ | ⭐⭐⭐⭐⭐ | ⭐⭐ |
| Vitamin requirements | Moderate | High | Highest |
| Protein requirements | Moderate | Moderate | Highest |
There is no "best" bariatric operation for everyone. During your consultation, we will discuss the benefits and considerations of each option.
Related topics & common questions
Is SADI-S Better Than Gastric Bypass?
One procedure is not necessarily better than the other. The right choice depends on your medical history, BMI, eating habits, and long-term goals.
| Feature | Gastric Bypass | SADI-S |
|---|---|---|
| Weight loss | Excellent | Excellent to Greatest |
| Diabetes improvement | Excellent | Excellent |
| Acid reflux improvement | Excellent | May improve; not ideal for severe GERD |
| Vitamin supplementation | Lifelong | Lifelong (more extensive) |
| Protein requirements | Moderate | Higher |
Protein Intake After SADI-S
Many patients require 80–100 grams or more of protein daily. Protein supports healing, preserves muscle, and maintains energy.
Signs of Protein Deficiency
- Muscle weakness
- Hair thinning or hair loss
- Swelling of the legs
- Poor wound healing
- Fatigue
Lifelong Vitamins and Follow-Up After SADI-S
Patients who undergo SADI-S may require lifelong monitoring of vitamins A, D, E, K, B12, iron, calcium, folate, zinc, copper, and protein levels.
Vitamin Guide After Bariatric Surgery →Bowel Changes After SADI-S
Some patients notice changes in bowel habits during the first several months as the body adjusts. Eating protein first, limiting high-fat foods, eating smaller meals, and staying hydrated can help.
Contact your surgeon if you experience:
- Persistent diarrhea lasting more than several days
- Signs of dehydration
- Severe abdominal pain
- Bloody stools
- Difficulty eating or drinking