Health
Comparing Surgery And Injections For Weight Loss
Health Points
- Bariatric surgery leads to greater and longer-lasting weight loss than weight loss injections in real-world settings.
- GLP-1 medications are effective but require lifelong use and careful monitoring for best results.
- Choosing between surgery and injections depends on weight loss goals, health conditions, and personal preferences.
For adults looking to manage their weight as they age, finding the most effective approach can make a big difference in overall wellness and long-term health. A recent study has revealed that bariatric surgery outpaces the latest weight loss medications, known as GLP-1 drugs, when it comes to total and lasting weight loss.
In the study, patients who had a sleeve gastrectomy or gastric bypass lost about five times more weight after two years compared to those using popular anti-obesity injections like semaglutide (Wegovy) or tirzepatide (Zepbound). On average, surgical patients lost 24% of their body weight—or around 58 pounds—while those who stuck with GLP-1 prescriptions for at least six months lost about 5%, or roughly 12 pounds.
Even those who took the drugs for a full year saw much smaller changes than patients who elected for surgery.
“Clinical trials show weight loss between 15-21% for GLP-1s, but this study suggests that weight loss in the real world is considerably lower,” explained Dr. Avery Brown, lead study author and surgical resident at NYU Langone Health.
Dr. Natalie Azar echoed this point, emphasizing that “what happens in a clinical trial might not actually be happening in the real world because people aren’t always compliant with medications.” Real-world results may differ because clinical trials offer close medical follow-up and experienced care. Dr. Karan Chhabra, the study’s senior author and a bariatric surgeon, added: “As more and more doctors are getting into the business of GLP-1 prescribing — and now there are these direct-to-consumer options for getting GLP-1 drugs — I think a lot of them are being given without careful oversight.”
“We have to take the prescribing of them much more seriously. I don’t think we can be giving them out like candy.”
The research compared over 38,000 people taking a GLP-1 drug and more than 12,000 who underwent bariatric surgery. The results highlight bariatric surgery as offering “superior sustained, long term weight loss” for eligible patients. However, Dr. Chhabra reminded readers that GLP-1 medications remain an important tool for obesity treatment, providing another way for patients to manage weight.
Dr. Shauna Levy, an obesity medicine physician and medical director at Tulane’s Bariatric and Weight Loss Center, agreed: “We’ve never had such a good obesity medicine. There are plenty of people that would benefit from GLP-1s, and they’re still the best category of medication we have on the market to treat this disease.”
Weight Loss Injections Vs. Surgery
GLP-1 drugs work by mimicking gut hormones that tell the body when it’s full, helping to reduce appetite and food intake. However, since obesity is a chronic condition, Dr. Levy said patients should plan to continue these medications for life to maintain results.
But according to Dr. Brown, up to 70% of people stop their GLP-1 treatment within one year. Early discontinuation, often due to side effects, high cost, or loss of insurance coverage, is partly why these drugs are less effective outside clinical trials. Dr. Chhabra commented that this is a “big part” of their limited effectiveness in day-to-day life.
Meanwhile, bariatric surgery actually alters the digestive system and permanently reduces the size of the stomach. As Dr. Azar pointed out, surgery is “very, very effective” and “one and done.” Dr. Levy added, “You have the tool with you always rather than going off or on, or having access or no access.” This procedure generally helps patients lose 20-50% of their weight and may be more cost-effective in the long run, Dr. Azar noted.
However, surgery is an invasive solution with its own risks, such as bleeding, infection, or nutritional deficiencies. Each option comes with trade-offs that should be weighed carefully.
Which Is Better: GLP-1 or Bariatric Surgery?
Experts say that making the best choice depends on individual goals, health status, and preferences. Dr. Levy encourages her patients to ask themselves whether they can commit to lifelong medication or would prefer a one-time surgical intervention. “A lot of people, when they get bariatric surgery, are doing it because they want to come off medicines. They want to stop taking their blood pressure medicine or their cholesterol medicine,” she explained. “So then taking a GLP-1 for the rest of their life may not be something that they want to do.”
For those seeking a one-time solution with lasting results, surgery is likely the better option, Dr. Chhabra said, though there is still a risk of weight regain even after surgery. If someone prefers to avoid surgery or doesn’t qualify, medications can offer a good alternative. “If you’re interested in losing more weight, then bariatric surgery might be the right answer for you,” Dr. Levy said.
Medical history also matters. Dr. Levy noted a history of acid reflux might worsen with GLP-1 drugs but could improve after surgery. Ultimately, individual discussions with a healthcare provider are important for finding the safest, most effective path for weight management as we age.
