Gastric bypass to MagDI conversion is a revisional bariatric procedure for patients who experience inadequate weight loss, weight regain, metabolic relapse, or complications after Roux‑en‑Y gastric bypass (RYGB). The procedure restores normal stomach continuity by reversing the bypass, then uses magnetic compression technology to create a controlled gastro‑duodenal or gastro‑jejunal anastomosis without stapling. MagDI enhances metabolic signaling while preserving pyloric function and avoiding multiple anastomoses.

The gastric bypass anatomy is reversed by reconnecting the gastric pouch to the remnant stomach. Magnetic compression rings are placed laparoscopically and/or endoscopically to create a controlled anastomosis between the stomach and small intestine. Over several days, the magnets form a standardized connection that enhances metabolic effect and improves long‑term weight regulation.

Benefits include improved metabolic outcomes, enhanced weight loss, reduced hunger, improved satiety, simplified anatomy, and avoidance of stapled anastomoses. MagDI preserves pyloric function, reducing dumping syndrome and improving food tolerance.

Candidates include patients with inadequate weight loss after bypass, weight regain, metabolic disease recurrence, dumping syndrome, marginal ulcers, or complications related to the gastric pouch or gastrojejunostomy. Patients seeking a less invasive revisional option may benefit.

The procedure is performed laparoscopically and/or endoscopically. The bypass is reversed, the stomach is restored, and magnetic rings are placed to create a controlled anastomosis. Most patients go home the same day or the next morning.

Risks include bleeding, leak, stricture, delayed anastomosis formation, nutritional deficiencies, and weight regain if long‑term habits are not maintained. Revisional surgery carries higher complexity due to scar tissue and altered anatomy.

Days 1–3: hydration, ambulation, pain control. Week 1: liquids. Week 2: soft foods. Weeks 3–4: gradual return to normal routines. By 30 days: improved energy, reduced hunger, and early metabolic improvements.

Patients typically experience improved metabolic outcomes and steady fat loss over 12–18 months. MagDI offers more durable results than bypass alone while avoiding the complexity of multi‑anastomosis procedures.

Dr. Nestor de la Cruz‑Muñoz is a national leader in complex revisional bariatric surgery and emerging technologies such as magnetic anastomosis. His expertise ensures safe bypass reversal and precise MagDI creation.

Most patients lose 15–22% of total body weight (TBWL) over 12–18 months after conversion. Results depend on adherence to nutrition, activity, and follow‑up.

MagDI conversion improves insulin sensitivity, fasting glucose, blood pressure, lipid profiles, and fatty liver disease. Improvements vary based on baseline metabolic status.

Long‑term success requires protein‑forward nutrition, resistance training, avoiding slider foods, maintaining muscle mass, and consistent metabolic follow‑up. Body composition monitoring is essential.

MagDI may improve reflux in some patients but may worsen it in others. Patients with severe GERD may benefit more from RYGB revision rather than reversal. Hiatal hernia repair is performed when needed.

Future revision options include limb length adjustments, conversion to OAGB, RYGB, SADI‑S, or DS depending on metabolic needs.

Preserving lean mass is essential for long‑term success. Patients are guided to prioritize protein intake, resistance training, hydration, and body composition monitoring.

Insurance coverage varies because MagDI is an emerging technology. Documentation of medical necessity, bypass complications, or metabolic disease may be required.

Pre‑op requirements may include bloodwork, imaging, endoscopy, nutrition consultation, psychological evaluation, and medication adjustments.

Nutrition progresses from clear liquids to full liquids, purees, soft foods, and then regular textures. Protein goals and vitamin supplementation are essential.

Early walking begins immediately after surgery. Light activity continues through week 2. Resistance training typically begins at week 4–6.

Miami is a major hub for patients from Latin America and the Caribbean. Our team supports travel coordination, virtual follow‑up, and streamlined pre‑op evaluation.