0203 312 6130

Professor Sanjay Purkayastha


Laparoscopic, General and Bariatric Surgeon

Private Medical Care:

General & gastroenterological surgery
Bariatric / weight loss surgery
Emergency abdominal conditions / surgery

Gastric Bypass


The operation is done as a laparoscopic (‘keyhole’ surgery) procedure while you sleep under a general anaesthetic.

The procedure will change how and what you eat.

  • You will not be able to eat as much as before because after this type of surgery, patients generally feel more satisfied after a meal and have less desire to eat.

  • You may also absorb fewer nutrients and calories from your food as a result of the shortening of your small intestine.

  • You may not tolerate foods containing fat, sugar, starch and sometimes milk, as well as you used to. If you eat too much of these types of foods you may actually start to feel ill, but this ‘side effect’ in itself could help you make dietary and lifestyle changes to achieve long term weight loss.

This method of surgery is recommended for patients with a BMI (body mass index) of 40 – 55. On average, patients tend to lose 30% of their total body weight during treatment and 70% of excess weight (fat).

> Read Further Information

What is a Roux-en-Y gastric bypass and how does it work?

This is an operation where some of the stomach and part of the small intestines are bypassed. The stomach is stapled to leave a smaller pouch and then a section of the small intestine is attached (usually by staples) to the small stomach pouch that has been created.

To Read Further Information Please Fill In The Form Below:

Do you want to book an appointment


07591 026 702


The Lindo Wing,
St Mary's Hospital, Praed Street,
W2 1NY

Request A Call Back
Make An Enquiry

Please note, most insurance policies in the UK do not cover weight-loss surgery. However, we will do our utmost to provide the best package for you should you choose to have your surgery with us.