Weight loss surgery, also called bariatric or metabolic surgery, is sometimes used as a treatment for people who are very obese.

It can lead to significant weight loss and help improve many obesity-related conditions, such as type 2 diabetes or high blood pressure.

But it's a major operation and in most cases should only be considered after trying to lose weight through a healthy diet and exercise.

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Weight loss surgery is available  if:

• you have a body mass index (BMI) of 40 or more, or a BMI between 35 and 40 and an obesity-related condition that might improve if you lost weight (such as type 2 diabetes or high blood pressure)

• you've tried all other weight loss methods, such as dieting and exercise, but have struggled to lose weight or keep it off

• you agree to long-term follow-up after surgery – such as making healthy lifestyle changes and attending regular check-ups

Speak to a GP if you think weight loss surgery may be an option for you.

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There are several types of weight loss surgery.

The most common types are:

• gastric band – a band is placed around your stomach, so you do not need to eat as much to feel full

• gastric bypass – the top part of your stomach is joined to the small intestine, so you feel fuller sooner and do not absorb as many calories from food

• sleeve gastrectomy – some of your stomach is removed, so you cannot eat as much as you could before and you'll feel full sooner

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All these operations can lead to significant weight loss within a few years, but each has advantages and disadvantages.

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