GLP-1s vs. Bariatric Surgery: the Latest Research

It’s a question the majority of weight loss patients have in the forefront of their minds. Why would I undergo a surgical procedure if I can lose weight with a weekly injection? Good question, glad you asked. Let’s look at the medical data, not what’s trending on TikTok. 

Studies Compare Bariatric Surgery and GLP-1 Effectiveness…

In a landmark head-to-head study, researchers from NYU Langone Health compared over 51,000 patients on GLP-1 medications versus those who had bariatric surgery. Surgical patients lost an average of 58 pounds over two years — roughly five times more than patients on GLP-1 medications, who averaged 12 pounds. Even patients who stayed on GLP-1 therapy consistently for a full year lost considerably less than surgical patients.

A separate large-scale study published in JAMA Surgery analyzed over 30,000 patients and found that bariatric surgery had two major benefits. Bariatric surgery produced greater weight loss and it also saved patients approximately $11,000 in ongoing costs over two years versus patients who continuously used GLP-1 medications.

The Discontinuation Problem Nobody Talks About

Clinical trials for GLP-1 medications show promising results, with patients losing 15-21% of their excess body weight. However, those results are from a controlled environment. Real-world outcomes tell a different story. The ASMBS study found that as many as 70% of patients discontinue GLP-1 treatment within one year. When patients stop the medication, the weight typically returns. 

When GLP-1s and Surgery Work Together

New research doesn’t highlight the “competition” between these two treatment options, but rather how they can complement each other. A 2024 study published in the ASMBS found that patients who used GLP-1 medications before surgery had a lower risk of post-operative complications. Another review of 19 studies found that GLP-1s used after surgery helped patients experiencing inadequate weight loss or regain get back on track. With this information, patients can work with medical professionals to determine if implementing a treatment strategy with both surgical and GLP-1 options is viable. 

GLP-1 or Bariatric Surgery?

GLP-1 medications are a legitimate tool — particularly for patients who don't meet surgical criteria, want to reduce surgical risk beforehand, or to prepare for a bariatric procedure. But for patients with a BMI of 35 or higher with two obesity-related health conditions or a BMI of 40 and higher, significant obesity-related health conditions, or a history of long-term weight regain, the research consistently points to surgery as the more effective and durable solution.

Since treatment involves an individualized approach, we encourage patients to schedule a consultation with Dr. Korman in order to determine which option is best for your needs.