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Mr Sanjay Agrawal

FRCS (Gen. Surg), FASMBS

Consultant Bariatric Surgeon

Gastric Sleeve Surgery - Frequently Asked Questions

Is gastric sleeve surgery right for me?

Gastric sleeve surgery could be a good option if you have tried and failed to lose weight through diet and exercise. You could be a suitable candidate if you have a BMI over 40 or a BMI of at least 35 and an obesity-linked condition such as type 2 diabetes. You will also need to be physically fit for surgery and committed to making long term changes to your lifestyle.

How does sleeve gastrectomy work?

Gastric sleeve surgery reduces the size of your stomach by up to 85%. The remaining part of your stomach will be stapled into a small tube or sleeve, about the size of a banana. You won’t be able to eat as much after the procedure and you should feel less hungry as you will be producing less of the hormones that stimulate your appetite.

How much weight can I lose after gastric sleeve surgery?

The amount of weight you lose will depend on how well you stick to your diet after surgery. The average patient will lose 50-60% of their excess weight within two years, but you could lose more in the long term.

Can gastric sleeve surgery help with diabetes and other obesity-linked conditions?

If you have a condition that is linked to your weight, you may see an improvement after surgery as you begin to lose weight. Gastric sleeve surgery is particularly effective for type 2 diabetics, which can sometimes disappear completely after the procedure. Your doctors will monitor your condition and make changes to your treatment if necessary.

What are the side effects of gastric sleeve surgery?

Common side effects after a sleeve gastrectomy include soreness and slight swelling around the surgical wounds. You may experience some nausea or discomfort after eating at first. You could also have dumping syndrome if you eat too much sugar. If you suffer from acid reflux, it could get worse after gastric sleeve surgery because your stomach will be smaller.

What are the risks of gastric sleeve surgery?

All medical procedures come with a small risk of complications. Approximately 5% of people who have gastric sleeve surgery will have complications of some kind. Although these are usually relatively mild and easy to treat, they can sometimes be more serious. The complications are fatal in 0.2% of people.

Potential risks of sleeve gastrectomy include:

  • Post-operative infections
  • Leaks where your stomach has been stapled together
  • Narrowing or stricture of the stomach sleeve after surgery
  • Damage to your organs during the operation
  • A bad reaction to the anaesthetic
  • Heavy bleeding or blood clots
  • Gallstones

Is gastric sleeve surgery reversible?

Gastric sleeve surgery is not reversible because part of your stomach will be removed. However, it is possible for the remaining part of your stomach to stretch in time, if you overeat. You will need to follow your diet in order to prevent this from happening.

Which foods should I avoid after gastric sleeve surgery?

You should be able to eat a normal range of foods within a few months of your sleeve gastrectomy. However, you should avoid foods that are high in fat and sugar as these will prevent you from losing weight. It is best to choose meals that include textured, filling foods that will satisfy your stomach. Liquids and soft foods will pass through your stomach too quickly, so you won’t feel full even when you’ve had enough.

Will I need to take vitamin supplements after gastric sleeve surgery?

You should be able to get all the nutrition you need from your food after a sleeve gastrectomy. Your doctor can provide advice on eating well after surgery and may recommend a supplement if you are finding it difficult to get enough of certain vitamins.

Laparoscopic Gastric Sleeve / Sleeve Gastrectomy Fees

  • Rivers Hospital£8,365*
  • Spire London East Hospital£8,582*
  • Nuffield Health Brentwood Hospital£9,340*For BMI < 50 & £11,450 For BMI > 50*
  • BMI The London Independent Hospital£9,950*For BMI < 50 & £10,950 For BMI > 50*

* Please note that these are guide prices and based on you being fit for the procedure - quotes may vary according to individual requirements and discuss this with team following your consultation.

The hospitals where Mr Agrawal works has 0% finance options to allow you to spread the sleeve gastrectomy cost over a 6, 10 or 12-month period completely interest-free.

* During the ongoing pandemic, there may be an additional fee for the COVID-19 test - please ring the relevant hospital for an up-to-date package price of the surgery

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Testimonials & Case Studies


  • Before

  • After

“Since having the operation I can now go into any shop and buy the clothes I love, rather than the clothes that just fit my size. I could never have imagined buying a size 10 before. The operation has not effected my social life in any way.”



  • Before

  • After

“My experience of Mr. Agrawal was very positive, he was very positive about doing the surgery, he was very relaxed and I was very confident in him. I would definitely recommend Mr. Agrawal.”



  • Before

  • After

“Mr. Agrawal, that’s a lot of fun, absolute brilliant guy.”



  • Before

  • After

“I was a bit scared going to see him, I’d brought my husband with me, in case I forgot what he said. Having someone beside me was very useful. He explained the procedures and types of procedure, and which one I could go for. He was very down to earth and straight forward, I found it very pleasant”



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