4 common types of weight loss surgery
Find out what to expect from bariatric surgery, including gastric bypass, lap band, sleeve gastrectomy, and intragastric balloon.



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If you’ve done your best to exercise regularly and stick to a healthy diet but still have a substantial amount of weight to lose, weight loss surgery may be for you. Bariatric surgery is a catchall term for procedures that limit stomach size and/or food absorption. You could be a candidate if you:
- Have a body mass index (BMI) of 35 or greater, or if you’re of Asian descent and have a BMI of 27.5 or greater
- Have a BMI between 30 and 34.9 and have metabolic disease, such as type 2 diabetes
Glucagon-like peptide-1 receptor agonist medications (GLP-1s) have rapidly become widely used for weight loss. People taking them may drop up to 20 percent of their bodyweight and often see improvements in their health, for as long as they’re on the medication.
Bariatric surgery, meanwhile, remains one of the most effective long-term ways to lose a large amount of weight, keep it off, and prevent obesity-related health conditions from developing or returning. Many people lose 50 to 75 percent of excess bodyweight following surgery, and the results typically hold up over time.
Here’s what to know about the available options.
Sources: Eisenberg D + 15
- Eisenberg D, Shikora SA, et al. 2022 American Society of Metabolic and Bariatric Surgery (ASMBS) and International Federation for the Surgery of Obesity and Metabolic Disorders (IFSO) Indications for Metabolic and Bariatric Surgery. Obes Surg. 2023 Jan;33(1):3-14.
- Johns Hopkins Medicine. Bariatric Surgery vs GLP 1. Accessed February 23, 2026.
- Johns Hopkins Medicine. Two Week Preoperative Liver Reduction Diet. November 2017.
- UF Health. Liquid Diet Before Bariatric Surgery. Accessed February 23, 2026.
- UCSF Health. Recovering from Bariatric Surgery. Accessed February 23, 2026.
- Atlantic Health System. Eating After Weight Loss Surgery. Accessed February 23, 2026.
- Mayo Clinic. Gastric Bypass Surgery. November 25, 2025.
- American Society for Metabolic and Bariatric Surgery. Roux en Y Gastric Bypass. Accessed February 23, 2026.
- Eghbali F, Bahardoust M, et al. Predictors for weight loss after Roux-en-Y gastric bypass: the trend and associated factors for weight loss. BMC Surg. 2022 Aug 11;22(1):310.
- Mayo Clinic Health System. Should I Take Vitamins and Supplements After Weight Loss Surgery. April 8, 2022.
- MedlinePlus. Gastric Bypass Surgery. July 22, 2024.
- Johns Hopkins Medicine. Laparoscopic Adjustable Gastric Banding. Accessed February 23, 2026.
- Johns Hopkins Medicine. Laparoscopic Sleeve Gastrectomy Overview. Accessed February 23, 2026.
- Brigham and Women’s Hospital. Laparoscopic Sleeve Gastrectomy. Accessed February 23, 2026.
- Johns Hopkins Medicine. Gastric Balloon for Weight Loss. Accessed February 23, 2026.
- Crossan K, Sheer AJ. Intragastric Balloon. 2023 Jan 30. In: StatPearls [Internet]. Treasure Island (FL): StatPearls Publishing; 2025 Jan–.