Patient Education1 min read

Bariatric (Weight-Loss) Surgery

Overview

Bariatric surgery refers to operations that change the anatomy of the stomach (and sometimes intestines) to limit how much you can eat and/or how much you absorb. The two most common in Saudi Arabia: **sleeve gastrectomy** (removing 75-80% of the stomach, leaving a banana-shaped tube) and **Roux-en-Y gastric bypass** (creating a small stomach pouch and rerouting the small intestine). Both done laparoscopically through 4-5 small cuts.

Who needs it

BMI ≥40 (severe obesity)

BMI ≥35 with type 2 diabetes, sleep apnea, severe joint disease, or other obesity complications

BMI 30-35 with poorly-controlled type 2 diabetes (in some criteria)

Failed serious attempts at weight loss with diet, exercise, and medications

Risks

•

Bleeding: 1-2%

•

Leak from staple line: 1-2%

•

Stricture: 1-3%

•

Internal hernia (bypass): 1-3%

•

Vitamin/mineral deficiencies if supplements not taken (lifelong risk)

•

Dumping syndrome with bypass (sweating, palpitations after sweets)

•

Mortality: 0.1-0.3% in modern series

•

Weight regain in some patients (especially if lifestyle isn't maintained)

Before the procedure

Comprehensive evaluation: medical, nutritional, psychological — usually 2-6 months.

Pre-operative weight loss often required — typically 5-10% of excess weight.

2-week liver-shrinking diet (very low calorie, mostly liquid) immediately before surgery — makes surgery safer.

Stop smoking 4-6 weeks before — strongly required.

Fast night before; specific instructions on stopping medications.

When to See a Doctor

Call your doctor or go to emergency if after the procedure you have severe or worsening abdominal pain, fever, repeated vomiting, heavy bleeding, black stools or fainting.

Why it is done

For severe obesity (BMI ≥40, or BMI ≥35 with diabetes, sleep apnea, or other obesity-related conditions) when lifestyle and medications haven't worked. Major benefits: 25-35% sustained weight loss, ~80% diabetes remission rate, MASLD reversal, sleep apnea resolution, GERD improvement (with bypass), reduced cardiovascular and cancer risk.

During the procedure

General anesthesia. Surgery is done laparoscopically (4-5 small incisions, 1 cm each). Sleeve takes 60-90 minutes, bypass 90-120 minutes. You wake up in recovery; pain is moderate and controlled with IV analgesics.

After the procedure

Hospital stay 1-3 nights. Pain controlled with paracetamol and small opioid doses. Diet progresses: clear liquids day 1, full liquids week 1, pureed week 2, soft week 3, regular small portions week 4-6. Lifelong vitamin and mineral supplements (multivitamin, iron, calcium, B12, vitamin D). Return to work in 1-2 weeks for desk jobs, 4-6 weeks for physical jobs. Follow-up at 1, 3, 6, 12 months and annually thereafter.

When you get the results

Weight loss begins immediately and continues for 12-18 months. Diabetes often improves within days to weeks. Most weight loss complete by 18-24 months.

Alternatives

GLP-1 agonists (semaglutide, tirzepatide) — significant weight loss but less than surgery. Endoscopic sleeve gastroplasty — lower weight loss but no incisions. Intragastric balloon — temporary, modest effect. Lifestyle and diet alone — rarely effective for severe obesity long-term.

In Saudi Arabia

Saudi Arabia is a global leader in bariatric surgery — high volumes, excellent outcomes. The Saudi Society of Bariatric and Metabolic Surgery sets standards. MOH and most insurance plans cover surgery for eligible patients. Many centers offer dedicated multidisciplinary teams (surgeon, dietitian, endocrinologist, psychologist).

Questions to ask your doctor

• Sleeve or bypass — which is right for me?

• What's my surgeon's annual volume?

• What lifelong supplements will I need?

• How will my diabetes/MASLD/reflux change?

Source and review

This guide comes from the Saudi Gastroenterology Association (SGA) patient library, prepared by the SGA Patient Education Panel. Last reviewed: 2026-04-24. It is for education and does not replace your doctor's advice.

Frequently Asked Questions

What is Bariatric (Weight-Loss) Surgery?

Why is Bariatric (Weight-Loss) Surgery done?

What are the risks of Bariatric (Weight-Loss) Surgery?

Bleeding: 1-2%; Leak from staple line: 1-2%; Stricture: 1-3%; Internal hernia (bypass): 1-3%; Vitamin/mineral deficiencies if supplements not taken (lifelong risk); Dumping syndrome with bypass (sweating, palpitations after sweets).

How do I prepare for Bariatric (Weight-Loss) Surgery?

Comprehensive evaluation: medical, nutritional, psychological — usually 2-6 months; Pre-operative weight loss often required — typically 5-10% of excess weight; 2-week liver-shrinking diet (very low calorie, mostly liquid) immediately before surgery — makes surgery safer; Stop smoking 4-6 weeks before — strongly required; Fast night before; specific instructions on stopping medications.