Sleeve Gastrectomy vs. Gastric Bypass

Sleeve gastrectomyGastric bypass
What it doesRemoves roughly 75-80% of the stomach, leaving a narrow "sleeve"Creates a small stomach pouch and reroutes part of the small intestine
ReversibilityNot reversibleTechnically reversible but rarely reversed in practice
Typically considered forPatients without significant acid reflux, as a first bariatric procedurePatients with reflux, type 2 diabetes, or higher BMI where malabsorption benefits are relevant
Nutritional follow-upLifelong vitamin/mineral monitoring recommendedMore intensive lifelong nutritional monitoring, since bypass affects nutrient absorption more

This table is a general comparison, not medical advice for your specific case — your BMI, comorbidities (diabetes, reflux, sleep apnea), and prior abdominal surgeries all affect which procedure a surgeon will actually recommend.

Eligibility Is Not Just a BMI Number

Bariatric surgery candidacy generally involves BMI thresholds combined with obesity-related health conditions or a track record of unsuccessful non-surgical weight-loss attempts — exact thresholds and required documentation vary by clinic and by the medical guidelines the surgical team follows. Expect a pre-operative medical evaluation, not just a booking form, before any clinic confirms you as a candidate.

What the Recovery Timeline Realistically Looks Like

  • Hospital stay of a few days is typical for both procedures
  • A staged post-operative diet (liquids, then purees, then soft food, then regular food) over several weeks is standard and non-negotiable for healing
  • Significant weight loss continues over 12-18 months, not immediately after surgery
  • Lifelong follow-up with vitamin/mineral supplementation is part of the procedure, not an optional extra

Real Risks to Discuss With Your Surgeon

As with any major abdominal surgery, risks include leaks at the staple/suture line, blood clots, nutritional deficiencies, and the possibility of needing a revision procedure years later. A responsible clinic will discuss these directly rather than presenting the surgery as risk-free — treat vague reassurance as a warning sign, not a comfort.

Post-Surgery Support Matters as Much as the Operation

Ask specifically what dietary counseling, follow-up consultations, and emergency contact protocol the clinic provides after you return home — bariatric surgery success depends heavily on the months of dietary adjustment that follow the operation, not just the surgery itself.