Gastric Sleeve FAQs — 40+ Questions Answered by Bariatric Surgeons

Gastric sleeve surgery (also called vertical sleeve gastrectomy or VSG) is a laparoscopic bariatric procedure that removes about 75–80% of the stomach. The remaining portion is shaped like a banana or "sleeve" — roughly the size of a small zucchini.

The operation works two ways: it restricts how much you can eat physically, and it lowers production of ghrelin (the hunger hormone) by removing the part of the stomach that makes most of it. Result: less hunger and earlier fullness.

Surgery is performed under general anesthesia through 4–5 small incisions and typically takes 60 minutes. See our complete gastric sleeve overview for procedure details.

The actual surgical time is approximately 60 minutes for most patients. With anesthesia setup and post-op recovery in the OR, plan on roughly 90–120 minutes total in the operating room area.

Your full hospital stay is typically 2 nights, allowing your team to monitor pain, hydration, and mobility before discharge.

No, gastric sleeve is permanent. Once the stomach tissue is removed, it cannot be restored. This is one of the key differences vs adjustable bands or balloons.

However, the sleeve can be converted to other procedures (gastric bypass, SADI-S, duodenal switch) if weight regain or complications occur. About 5–10% of sleeve patients eventually need revision surgery.

The new stomach edge is sealed with titanium surgical staples using an automated stapling device. The staple line is then often reinforced with sutures or a buttress material to reduce leak risk.

Titanium is biocompatible and remains in place permanently — it does not set off airport metal detectors and is safe for MRI scans.

The new sleeve typically holds about 2–4 ounces (60–120 ml) immediately after surgery — roughly the size of a banana. Over the first 12–18 months it expands modestly to hold 6–8 ounces.

The exact volume is calibrated using a sizing tube (usually 36–40 French) during surgery to ensure consistent results across patients.

At ALO Bariatrics, gastric sleeve is performed laparoscopically in 100% of routine cases. We use 4–5 small incisions (5–12 mm), no large abdominal cut.

For patients seeking minimal scarring, we also offer SILS (single-incision laparoscopic surgery) through one incision hidden in the belly button, and Da Vinci robotic gastric sleeve for select cases.

Standard laparoscopic gastric sleeve leaves 4–5 small scars across the upper abdomen, each 5–12 mm. Most fade significantly in 6–12 months and are easily covered by clothing including swimwear.

SILS patients have one small scar inside the belly button, virtually invisible after healing.

Some natural stretching does occur — typically 30–50% volume increase over the first 12–18 months, then stable. However, significant stretching causing weight regain is usually behavioral rather than anatomical: persistent overeating, grazing on calorie-dense foods, or high-volume liquid calories.

Following the long-term post-WLS dietary protocol and lifelong follow-up keep results durable.

At ALO Bariatrics, our practice criteria accept patients with BMI above 30, evaluated individually based on overall health, comorbidities, and goals.

This is more inclusive than older standard guidelines (which required BMI 40+, or BMI 35+ with at least one comorbidity such as type 2 diabetes, hypertension, or sleep apnea). Modern ASMBS 2022 guidelines also support bariatric surgery starting at BMI 30 for patients with metabolic disease — aligning with our long-standing patient-centered approach.

Use our 2-minute eligibility quiz with BMI calculator to see if you qualify.

The standard adult range is 18 to 65 years. Patients over 65 are evaluated individually based on overall health, comorbidities, and surgical risk — not age alone.

For adolescents, ASMBS guidelines support gastric sleeve for select patients aged 13–17 with BMI ≥ 35 and serious comorbidities. ALO does not currently perform adolescent bariatric surgery.

Yes — and many patients with type 2 diabetes see significant improvement after gastric sleeve. Studies show that bariatric surgery can lead to remission or reduced insulin requirements in a meaningful percentage of T2 diabetes patients with obesity.

Our team works with your endocrinologist to manage medications safely before, during, and after surgery. Read more about bariatric surgery and type 2 diabetes.

Absolute or temporary contraindications include:

• Active substance abuse or untreated alcohol use disorder
• Untreated severe mental illness (psychosis, severe untreated bipolar disorder)
• Pregnancy or planning pregnancy within 12–18 months
• Severe cardiopulmonary disease that increases surgical risk unacceptably
• Severe untreated GERD with large hiatal hernia (gastric bypass or revision strategy preferred)
• Inability or unwillingness to commit to lifelong dietary and follow-up changes

A responsible clinic declines patients who are not appropriate candidates rather than operating regardless.

Most patients can perform normal light activities within 48 hours after surgery. Full timeline:

• Day 0–2: hospital stay, walking encouraged
• Day 2–7: rest at hotel, light walks, liquid diet
• Week 1–2: return to desk-job work for many patients
• Week 4–6: resume moderate exercise
• Week 6+: heavy lifting (>30 lb), full athletic activities

Individual recovery varies based on age, fitness, and other factors.

Post-op pain is generally mild to moderate — most patients describe it as "soreness" or "pressure" rather than sharp pain. Causes include the CO2 used to inflate the abdomen during laparoscopy and natural tissue healing.

Pain is treated with anti-inflammatory and non-steroidal analgesics. For patients with chronic pain conditions, opioid options are available short-term. Early walking is the single most effective remedy for the gas-related discomfort.

You can typically shower 24–48 hours after surgery once incision dressings are removed by your surgical team. Avoid soaking (no baths, pools, hot tubs, or oceans) for 2 weeks until incisions are fully sealed.

Pat incisions dry rather than rubbing. No lotions or creams on incisions for the first 2 weeks unless your surgeon prescribes them.

You can resume driving when:

• You are off all narcotic pain medications
• You can comfortably perform an emergency stop without abdominal pain
• Typically 5–10 days post-op for most patients

Do not drive home from Mexico — arrange ground transport or your travel companion drives.

Walking is encouraged from day 1. Progression:

• Week 1–2: walking only, gradually increasing distance
• Week 3–4: light cardio (stationary bike, light elliptical)
• Week 4–6: resistance training with light weights
• Week 6+: heavy lifting, swimming, full sports

Strenuous core exercises (sit-ups, heavy abdominal work) wait until 8 weeks to allow internal healing.

Average results published in long-term studies:

• 6 months: 30–40% of excess weight lost
• 12 months: 50–70% of excess weight lost
• 2 years: peak weight loss, typically 60–70% of excess
• 5+ years: 50–60% of excess weight loss maintained on average

Individual results vary based on starting BMI, adherence to diet, exercise, and follow-up. Some patients lose more, some less. Results vary by patient.

Yes — fertility often improves after weight loss. However, doctors recommend waiting 12–18 months after surgery before trying to conceive, so:

• Your weight stabilizes
• Nutritional levels are optimized
• The fetus isn't competing with rapid maternal weight loss

Use reliable contraception during the first year. Discuss with your OB-GYN before trying to conceive.

Some weight regain (10–20% of lost weight) is common 2–5 years post-op. Significant regain (30%+) usually has identifiable causes: drifting from protein-first habits, grazing, sedentary lifestyle, or in some cases anatomical changes (stretched sleeve).

Options if regain is significant:

• Behavioral reset with bariatric nutritionist
• Medical weight-loss medications
• Revision surgery (sleeve to bypass, SADI-S, or duodenal switch)

Don't wait — early intervention is more effective.

Loose skin is common after significant weight loss, especially in patients losing 80+ pounds or those over 40 with reduced skin elasticity. Most loose skin appears in:

• Lower abdomen (apron)
• Upper arms ("bat wings")
• Inner thighs
• Breasts and chest

Some skin retracts naturally over 12–24 months. Persistent loose skin is addressed with post-bariatric body-contouring surgery typically 18+ months after weight stabilization.

ALO Bariatrics operates in three locations:

• Tijuana — easiest for U.S. patients (15-min drive from San Diego airport)
• Guadalajara — major medical hub, accredited hospital
• Puerto Vallarta — coastal city, recovery in resort setting

All three use accredited private hospitals with full ICU, blood bank, and intensivist coverage.

Yes — U.S. and Canadian citizens need a valid passport for entry into Mexico by air. For Tijuana arrival via San Diego, a passport book is required for return to the U.S.

Passport card works for land border crossings only (not air return). Make sure your passport is valid for at least 6 months from your travel date.

Standard stay is 4–5 days total:

• Day 1: arrival, pre-op evaluation, hotel check-in
• Day 2: surgery + 1st night in hospital
• Day 3: 2nd night in hospital
• Day 4: discharge to hotel for monitoring
• Day 5: cleared to fly home

Extending an extra night for buffer is common and inexpensive.