Mechanism of Action
How Sleeve Plus Works
An educational walkthrough of the anatomic changes, hormonal effects, and physiologic rationale behind sleeve gastrectomy combined with a duodeno-ileal bipartition.
Step by step
Anatomic and physiologic changes
1. Vertical sleeve gastrectomy
A large portion of the stomach is removed along the greater curvature, leaving a narrow, banana-shaped sleeve. This reduces meal volume and is associated with changes in ghrelin and other gut hormones.
2. Duodeno-ileal anastomosis
A new connection is created between the early small intestine (duodenum) and a more distal segment of the small intestine (ileum). Recent reports describe magnetic compression devices that form this anastomosis over weeks rather than at a single stapled connection.
3. Preserved primary food stream
Unlike full bypass procedures, the original digestive route is preserved. Nutrients flow through both the standard pathway and the new bipartition, maintaining duodenal exposure to food.
4. Distal incretin signaling
Earlier nutrient contact with the distal small intestine is thought to increase release of GLP-1 and PYY — hormones associated with satiety, insulin secretion, and glucose regulation in published bariatric physiology research.
Physiology
What changes after surgery
Satiety
Reduced gastric volume and altered ghrelin signaling are associated with earlier fullness and decreased hunger between meals.
Incretin response
Earlier nutrient exposure of the distal small intestine increases postprandial GLP-1 and PYY release in published bariatric physiology studies.
Glucose regulation
Improved insulin sensitivity and beta-cell response have been reported after metabolic procedures, supporting use in selected patients with type 2 diabetes.
Energy balance
Reduced intake combined with hormonal shifts contribute to sustained weight loss in published cohorts, though individual results vary.
Nutrient absorption
Because the standard pathway is preserved, absorption of macronutrients and most micronutrients is less impacted than after full bypass — but supplementation is still recommended.
Long-term adaptation
Body composition, hormones, and metabolic rate continue to adapt for many months after surgery. Follow-up is essential.
Important context
What this mechanism does not mean
The mechanism described here summarizes published bariatric physiology and early Sleeve Plus literature. It does not imply guaranteed weight loss, guaranteed diabetes remission, or superiority over established procedures. Hormonal and metabolic changes vary by patient and over time.
Candidacy, expected outcomes, and risk-benefit balance must be evaluated by a qualified bariatric surgeon for each individual.
Content on this page is reviewed for medical accuracy by bariatric and metabolic surgery professionals associated with Obesity Control Center. Reviewed for accuracy of procedure descriptions, evidence summaries, risk discussion, and patient-safety language. Educational information only — not medical advice. No outcome can be guaranteed and individual results vary.
Last reviewed: June 2026 · Editorial Policy · Medical Review Policy