The use of Ozempic and other semaglutide medications for weight loss has surged over the last few years, as numerous individuals have achieved remarkable weight loss success. However, a 2025 study by New York University determined that bariatric surgery is dramatically more effective than the current injection trend in terms of weight loss success. The NYU study has revived discussions regarding medical treatments for obesity, as so many patients continue to suffer from weight-induced problems.
Key Findings of the Study
- The research was conducted by experts at New York University (NYU)
- The study directly compared two major bariatric surgeries — sleeve gastrectomy and gastric bypass — with GLP-1 receptor agonist medications like semaglutide (Ozempic, Wegovy) and tirzepatide (Mounjaro).
- Researchers used real-world health records and carefully matched patients based on age, body mass index (BMI), blood sugar levels, and other health factors for fair comparison.
- The study followed patients over two years to measure actual results in everyday conditions rather than controlled clinical trials
Weight Loss Results
- The bariatric surgery group reduced total body weight by an average of 25.7% after two years.
- The GLP-1 group lost an average of 5.3% of their weight within two years.
- As you can see from this study, bariatric surgery is about 5 times more effective in the real world.
- Even at other time points (3 months, 6 months, and one year), surgery still provided better results than the weight-loss drugs.
Clinical trials of GLP-1 drugs tend to show weight loss of 15%-21% with perfect compliance, but this study reflects a real-world scenario and much lower results.
How Surgery Outperformed Meds
- Permanent: Bariatric surgery alters the digestive tract and stomach permanently, leading to long-lasting weight loss.
- Poor Persistence: Up to 70 percent of patients drop off GLP-1 therapy within one year due to side effects, cost, or otherwise.
- Consistent: Surgery results are consistent without constant daily or weekly injections.
- Metabolic: Gastric bypasses change gut hormones and bacteria, which favor better appetite regulation and metabolic function.
- GLP-1 drugs are amazing in trials, but their effectiveness in practice and weight loss is far less, even in those patients who adhere to prescriptions for the full year,” stated Avery Brown, surgical resident, NYU.
Expert Opinion:
- “Metabolic and bariatric surgery is far superior and more sustainable,” stated Ann M. Rogers, M.D. President American Society for Metabolic and Bariatric Surgery.
- Experts stated that while medications are easier to begin, surgery produces life-changing results for severely obese patients.
Additional benefits of these treatments
Both treatments had benefits for the control of blood glucose levels, but the surgical treatment was more effective in curing type 2 diabetes
- GLP-1 treatments were originally intended to treat diabetes, but were also shown to reduce the risk of stroke, heart disease, and some forms of cancer.
- Patients who underwent the surgery also saw significant improvement in other conditions associated with obesity, such as sleep apnoea, joint pain, and fatty liver disease.
- Several patients commented on the improvement in their movement, quality of life, and energy levels.
Important Points to Note
- Funding came from the American Society for Metabolic and Bariatric Surgery (ASMBS), and the authors are supporters of surgery.
- The results are great, but surgery is not the right option for everyone and does have risks involved.
- Known common side effects for GLP-1 medication include nausea, vomiting, diarrhea, and constipation.
- Surgery is not only a huge operation, but it also involves hospitalization, recovery, and requires patients to maintain long-term lifestyle changes involving their diet.
- Nutrition must strictly adhere to guidelines, and a vigorous exercise program must be maintained long-term to get the best results and avoid complications after surgery.
- Non-invasive GLP-1 medications prove appealing to many individuals hoping to avoid an operation.
Challenges and limitations
The low number of people eligible for surgery who undergo the procedure is due to many factors. Including fear of surgery, a general lack of awareness and knowledge, and also the high financial costs involved. Many areas lack readily available treatment facilities.
GLP-1 drugs, though easier to obtain, have major barriers for the long-term, with the monthly cost being significant, and the necessity for an ongoing treatment regimen required; insurance availability differs greatly between the two treatments.
Researchers have recognized that although outcomes vary based on factors like age, initial weight, genetics, and lifestyle, commitment to following the treatment regimen.
Future Outlook and Recommendations
Further research is required to determine which patient groups are most likely to benefit from medical versus surgical therapy.
Health professionals should strive to encourage patients to adhere to GLP-1 therapies.
Studies should incorporate the evaluation of out-of-pocket costs as a contributor to outcomes.
It seems the advantage of a medical/surgical combined therapy for some patients is becoming more evident.
Physicians think that following a personalized treatment plan is best, provided a proper clinical evaluation has been performed
Bottom Line:
Regarding very obese patients and comorbid disease states-bariatric surgery remains our most effective modality. Real-life outcomes are almost five times higher when surgery is performed as compared with OZEMPIC or related agents, with dramatically higher durable weight loss at one year. Ultimately-Your own condition, lifestyle, tolerance for risk, and individual goals will determine the appropriate therapy. GLP-1 agents are effective options for non-operative patients or those with milder degrees of obesity. Any patient desiring weight loss therapy should visit with their appropriate clinician, discuss the pros and cons of all treatments, and then proceed with a plan that they are comfortable with. Bariatric surgery or one of the newer drug treatments are not mutually exclusive effective treatments of weight loss, and it’s important to delineate and treat these entities distinctly. With or without surgical intervention-Patients must maintain a healthy diet, exercise program, appropriate sleep habits, and stress reduction, as these behavioral components of weight loss may even help optimize outcomes. Lifestyle modification in conjunction with a successful medical treatment plan has the greatest chance of working.
