Can we cure type 2 diabetes with surgery?

Written by: Mr Ali Alhamdani
Published: | Updated: 24/05/2023
Edited by: Nicholas Howley

At the Annual Congress of the Egyptian Society of Obesity Surgery, one of London’s leading bariatric surgeons, Mr Ali Alhamdani, presented on the promises of mini-gastric bypass surgery – and the remarkable evidence that it has the potential not only to cure obesity, but type 2 diabetes as well. In our interview with Mr Alhamdani, we discussed the emerging theories behind this extraordinary link, and what this could mean for the future of diabetes treatment.


What is a mini-gastric bypass?

A mini-gastric bypass is very similar to a normal gastric bypass – both procedures aim to reduce the size of the stomach and bypass part of the small bowel, resulting in dramatic weight loss. A mini-gastric bypass makes just one joint between the bowel and stomach, as opposed to two, and the operation is shorter – typically taking just over an hour, compared to two hours in the normal gastric bypass.

There are many advantages to performing a mini-gastric bypass. Recovery is faster for the patient, and there are fewer complications such as clots, bleeding. Because there is less interference with the bowel, the risk of developing internal hernias is also reduced.


When was the link with diabetes discovered?

The discovery that surgery could cured type 2 diabetes was entirely accidental! Surgeons have been performing gastric bypass surgery since the 1950s, originally to treat stomach ulcers. They simply happened to find that those with type 2 diabetes who underwent gastric bypass surgery experienced significantly reduced glucose levels after the procedure.

These initial results have since been backed up by long-term studies which showed that even 10 years after surgery, 70-80% of patients had controlled or resolution of type 2 diabetes.

Mr Alhalmdani presenting on gastric bypass surgery at the 14th Annual Congress of the Egyptian Society of Obesity Surgery.


Why would a gastric bypass cure diabetes?

Even though we’ve been observing the effect for over 60 years, the truth is we still don’t know how this operation exactly works. One theory is that because the patient loses weight, the body cells’ sensitivity to insulin increases. Another theory is that gastric bypass surgery encourages the production of certain intestinal hormones, which increases the production of insulin. A third branch of thought is that the procedure interferes with the absorption of bile acids and salts and accordingly decrease the absorption of harmful sugars and carbohydrates.

But these are still emerging theories, and of course it could be multi-factorial effects of this procedure on human body metabolism.


Isn’t this a game-changer for diabetes treatment?

It is absolutely a game-changer. All of the medical treatments we have for diabetes they don’t tend to cure the disease itself but keep the symptoms partially under control. The notion that you can actually cure the condition is ground-breaking.

It’s also a game-changer when you think about it from the perspective of cost. We currently spend £3,000 - £4,000 a year treating someone with diabetes. A mini-gastric bypass costs about £8,000. If it’s successful in curing the patient of diabetes, it will pay for itself within just two years. When you consider that there are up to four million people in the UK with type 2 diabetes, that’s an enormous cost saving.


Why aren’t more people offered this treatment?

In the UK, gastric bypass surgery is already considered for anyone with a BMI over 30. But only a small proportion of eligible patients receive the treatment. Since NICE recommendations were introduced we’ve only carried out approximately 50,000 procedures in UK on patients with a BMI over 30, against a total potential patient group of four million people.

There are a number of reasons. A big hurdle is that there are simply not enough surgeons in the UK who specialise in gastric bypass surgery. Furthermore, it’s a large upfront cost which NHS England might not have the resources for.

The evidence of mini gastric bypass surgery’s effectiveness continues to build, and plenty of working parties are pushing the NHS in this direction. Overall, there are grounds for optimism that it could eventually become a key tool in our fight against the UK’s growing diabetes epidemic.


Mr Ali Alhamdani is a leading bariatric surgeon based in London. Ypu can book a consultation with Mr Alhamdani via his Top Doctors profile.

By Mr Ali Alhamdani

Mr Ali Alhamdani is one of London's leading bariatric surgeons. He has performed over 3,500 procedures and provides the full range of obesity surgery procedures including gastric bypass, gastric band, gastric sleeve and revisional bariatric surgery.

Mr Alhamdani has a reputation for performing extremely safe surgery with a very low complication rate and a zero mortality rate. He has had extensive training in laparoscopic (keyhole) surgery in the UK, Europe and America and is a surgeon at the forefront of his field. He is specialised in upper gastro intestinal tract conditions including gallstone disease and its management and in peptic ulcer disease. He is also expert in a wide range of bariatric surgery including the mini gastric bypass which is both effective and safe.

Mr Alhamdani always prioritises the wellbeing of his patients and makes sure they understand all of the options available and are actively involved in making decisions about their treatment. He is head of an international bariatric multidisciplinary team and is one of nine surgeons in the world offering international bariatric fellowship to new surgeons with the affiliation of the University of Oxford.

Mr Alhamdani has published more than 300 publications in reputable scientific magazines and presents in national and international conferences. He also regularly publishes updates on his scientific and international events and advances in treatment on his Instagram page. His Instagram handle is

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