26studies
A 2024 meta-analysis pooled outcomes from 1,873 people.
Open the study ↗SASI BYPASS SURGERY GUIDE
SASI bypass surgery, from decision to lifelong care.
Understand the procedure, the limits of the evidence, possible benefits and complications, recovery, diet, and why follow-up does not end after surgery.
DECISION COMPASS↗
A better decision starts with three questions.
- 1Could it fit my health needs?
Eligibility is more than a BMI.
- 2Why this procedure?
Alternatives should be compared openly.
- 3Is long-term care in place?
Surgery starts the follow-up; it does not end it.
IndependentNo clinic ranking or paid treatment claims
ReferencedMajor claims link to research or guidance
BalancedUncertainty and risk sit beside potential benefit
CurrentEvidence search: August 2026
START HERE
Follow the question that brought you here.
There is no single “best” bariatric operation for everyone. Choice depends on your health, anatomy, priorities, risk profile, and ability to access long-term care.
01
What is SASI bypass?
See how sleeve gastrectomy and one gastro-ileal connection create two routes for food — and why that matters.
Explore the procedure →02Who may be a candidate?
BMI is only a starting point. Metabolic health, prior treatment, anatomy, and lifelong follow-up all shape the decision.
Understand eligibility →03Recovery, diet & follow-up
A practical roadmap for diet stages, hydration, protein, supplements, movement, lab work, and long-term support.
See the recovery plan →04Risks & complications
Learn the early and late risks, reflux questions, urgent warning signs, and what to ask a bariatric centre.
Review the risks →SASI IN TWO MINUTES
One stomach, two pathways for food.
SASI — single-anastomosis sleeve ileal bypass — combines a sleeve gastrectomy with one connection between the lower stomach and a distal segment of small bowel.
In plain language
Read the detailed procedure guide →Some food continues through the pylorus and duodenum. Some passes through the new gastro-ileal connection and reaches the ileum earlier. The operation aims to influence volume, satiety, nutrient flow, and gut-derived metabolic signalling.
Sleeve-shaped stomach
STOMACH
Natural routePylorus → duodenum → small bowel
New routeSingle gastro-ileal connection
Preserved natural passage New pathway
WHAT DOES THE EVIDENCE SAY?
Promising — with important unknowns.
SASI is newer than sleeve gastrectomy and Roux-en-Y gastric bypass. Short- and medium-term findings are encouraging, but high-quality long-term comparative evidence remains limited.
35%mean total weight loss
The pooled estimate at 12 months, with substantial variation between studies.
Not a personal outcome guarantee≈88%type 2 diabetes remission
The same review’s pooled 12-month estimate; definitions and individual results may differ.
How we interpret evidence →Why do these numbers need context?
Many studies are observational, follow-up is relatively short, and surgical details differ across centres. A pooled rate should not be used as an individual prediction.
PROCEDURES ARE NOT INTERCHANGEABLE
SASI, sleeve, and Roux-en-Y are not the same operation.
This overview supports questions for a qualified bariatric team; it is not a personal recommendation.
| Feature | SASI bypass Portal focus | Sleeve gastrectomy | Roux-en-Y bypass |
|---|---|---|---|
| Stomach volume reduced | Yes | Yes | Small gastric pouch |
| New bowel connections | One | None | Two |
| Pyloric food passage | Partly preserved | Preserved | Bypassed |
| Potential for malabsorption | Present | Generally lower | Present |
| Long-term evidence base | Developing | Large | Among the largest |
CARE PATHWAY
One day of surgery. Lifelong follow-up.
Results are shaped beyond the operating room. Preparation, nutrition, movement, mental wellbeing, medication review, and laboratory monitoring all belong to the same plan.
Open the recovery guide- 01Before a decision
Multidisciplinary assessment
Surgical, medical, nutrition, psychological, and anaesthetic review — plus tests and an individual risk-benefit discussion.
- 02Hospital phase
Surgery and early recovery
Pain control, early mobilisation, hydration, and monitoring for complications according to the centre’s protocol.
- 03First 6 weeks
Staged food progression
A gradual move from liquids to purée, soft foods, and suitable solids, with an emphasis on protein and hydration.
- 04First 2 years
Structured specialist follow-up
Weight is only one measure: labs, nutrition tolerance, muscle preservation, mental wellbeing, and related conditions also matter.
- 05For life
At least annual review
Nutrient deficiencies and late complications can be silent, so clinical and laboratory monitoring should continue long term.
A STARTING POINT, NOT A VERDICT
Calculate BMI — then read it in context.
The 2022 ASMBS/IFSO guidance recommends metabolic and bariatric surgery for BMI 35 or above regardless of related disease, and says it may be considered at BMI 30–34.9 when metabolic disease is present or durable improvement has not been achieved with non-surgical care.
Read the eligibility guide →Your body mass index38.1
Class II obesity range
BMI alone cannot determine surgical eligibility. Body composition, health conditions, previous treatment, and individual risk all matter.
SHORT ANSWERS
Frequently asked questions
Clear starting points for a more useful conversation with a bariatric team.
Is SASI bypass reversible?+
The gastro-ileal connection can technically be closed or revised, but the sleeve component removes stomach tissue. It is therefore not accurate to describe the full procedure as simply reversible, and revision surgery may carry higher risk.
Does SASI bypass cure type 2 diabetes?+
No result is guaranteed. Studies report high remission rates, but definitions, follow-up, and patient characteristics vary. Remission still requires long-term monitoring because diabetes can recur.
Are vitamins needed for life after SASI bypass?+
Long-term supplementation is commonly required after bariatric surgery. The exact products and doses should be prescribed and adjusted using diet history and laboratory results.
Are SASI and SADI-S the same operation?+
No. SASI connects the stomach to the ileum, while SADI-S connects the duodenum to the ileum. The anatomy, nutritional implications, and risk profile should not be treated as identical.
Can pregnancy be planned after SASI bypass?+
Pregnancy is generally delayed until the rapid weight-loss phase has passed. Timing and nutrition monitoring should be planned with the bariatric and obstetric teams.
YOUR NEXT STEP
Better questions support safer decisions.
Use the consultation checklist before meeting a bariatric surgeon.