Bariatric Surgery vs GLP-1s: Can They Work Together?
Key Takeaways
- Bariatric surgery and GLP-1 medications are both evidence-based treatments for obesity, but they work differently.
- The right treatment depends on factors such as your health, weight-loss goals, medical history, and personal preferences.
- Bariatric surgery generally produces greater and more durable weight loss, while GLP-1 medications offer a nonsurgical option.
- For some patients, GLP-1 medications and bariatric surgery may be used together as part of a long-term treatment plan.
Weight-loss treatment has changed dramatically in recent years. With GLP-1 medications becoming more widely available, people considering treatment for obesity may wonder how medications compare with bariatric surgery, or whether they have to choose between the two.
The answer isn't always either/or. For some people, GLP-1 medications may be used before or after bariatric surgery as part of a long-term approach to weight management.
So, how do you know which approach is right for you? Wilfredo Cruz, MD, a cardio metabolic and obesity medicine expert, and Kaci Schiavone, MD, a bariatric surgeon, explain what to consider.
How GLP-1 Medications Work
GLP-1 medications work by mimicking the hormones that your body naturally makes after you eat. Depending on the medication, they can help you feel full sooner, stay full longer, and reduce hunger.
Common medications used for weight management include:
- Semaglutide, the active ingredient in Wegovy and Ozempic
- Tirzepatide, the active ingredient in Zepbound
- Liraglutide, the active ingredient in Saxenda
- Orforglipron (Foundayo): oral GLP-1 medication taken as a daily pill
For most people, weight-loss medications are considered long-term treatments. Stopping a medication may lead to some weight regain.
Note: If you’re comparing Ozempic vs. bariatric surgery, it’s important to know that Ozempic contains semaglutide, the same active ingredient as Wegovy, but Ozempic is approved for Type 2 diabetes, while Wegovy is approved for chronic weight management.
How Bariatric Surgery Works
Bariatric (or metabolic) surgery changes the digestive system to help people lose weight and improve health conditions associated with obesity. Surgery alters the hormones in your body that control hunger, fullness, and blood sugar to allow you to lose weight.
The major bariatric surgeries offered at URochester Medicine can:
- Reduce how much food the stomach can hold
- Affect metabolism
- Improve conditions such as Type 2 diabetes
Bariatric surgery creates permanent changes, but that doesn't mean the work ends after surgery. Nutrition, physical activity, vitamins, and regular follow-ups remain important for long-term success.
GLP-1 vs. Bariatric Surgery: How Do the Results Compare?
Bariatric surgery (or metabolic surgery) is the most effective weight loss treatment available when it comes to weight-loss potential.
Bariatric Surgery | GLP-1 Medications | |
| Weight Loss* | Gastric sleeve: 25-30% TBWL or 50-70% EWL** Gastric Bypass: 30 - 35% TWBL or 60-80% EWL | Liraglutide: 5-10% Semaglutide: 15-21% Tirzapatide: 18-22% |
| Risks and side effects | Surgical and anesthesia risks, recovery, and nutritional deficiencies | Common gastrointestinal side effects and other medication-specific considerations |
| Long-term maintenance | Creates lasting physical changes, but patients still need long-term nutrition, activity, and medical follow-up | Generally considered long-term medications, but weight regain can occur after stopping them |
*Weight loss numbers are for non-diabetic patients ONLY
**TBWL is Total Body Weight Loss; EWL is Excess Weight Loss
Current research shows that metabolic and bariatric surgery generally leads to greater and more durable weight loss than GLP-1 therapy, particularly for people with a BMI above 45.
“For some patients, medication alone may not lead to enough weight loss to achieve improvements in conditions such as diabetes, high blood pressure, or sleep apnea,” said Dr. Schiavone.
Can You Take GLP-1 Medications After Bariatric Surgery?
Yes. For some people, GLP-1s and bariatric surgery can work together in a long-term weight-management plan.
Before Bariatric Surgery
For some patients, anti-obesity medications may be tried before surgery or used while preparing for surgery. Reducing excess weight beforehand can make surgery safer and may lower the risk of complications.
“I generally recommend trying an oral anti-obesity medication, along with diet and exercise, before considering bariatric surgery,” said Dr. Cruz.
After Bariatric Surgery
Weight-loss medications such as GLP-1s may be considered after surgery if someone:
- Regains weight after surgery
- Doesn’t lose as much weight as expected
- Needs additional help managing obesity or a related health condition
“If someone begins gaining weight again after initially losing a significant amount, we may consider adding a GLP-1 or another anti-obesity medication to help manage that weight regain,” said Dr. Cruz.
Exactly when or whether the two treatments should be combined depends on your health and should be decided with your bariatric and medical weight-management teams.
Why Nutrition Counseling Is Vital with GLP-1 Medication
Which Weight Loss Treatment Is Right for Me?
There isn't one treatment that's best for everyone, and choosing a treatment doesn't necessarily mean you're choosing it forever.
“The most important thing for me is for my patients to understand that their weight-loss journey can be very different from someone else’s,” said Dr. Cruz.
Questions to ask your doctor or weight-loss management team when considering weight-loss treatments:
- What results could I realistically expect from each treatment?
- How could each option affect my existing health conditions?
- Am I comfortable taking medication long-term?
- What are the risks and long-term follow-up requirements?
- Could medication and surgery both play a role in my treatment?
The answers may also change over time. Weight management is long-term care, and the treatment that makes sense today may look different several years from now.
Who Qualifies for GLP-1s vs. Bariatric Surgery?
If you're considering surgery, learn more about who qualifies and what to expect. Your weight-management team can help determine which treatment may be right for you.
Explore Weight Management Options
University of Rochester Medicine offers personalized weight-management care, including lifestyle programs, nutrition counseling, medication, and bariatric surgery. Explore your options and find the support that’s right for you.
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