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Guy's and St Thomas' centre for obesity

Providing help with obesity management and weight loss surgery

About obesity

The Guy's and St Thomas' centre for obesity has been active in the field of obesity management and weight loss (bariatric) surgery for over 30 years. The service is provided jointly by Guy's and St Thomas' Hospital and King's College Hospital and has a reputation as a centre of excellence for weight loss surgery.

The service is provided by a team based at Guy's Hospital. We have a dedicated environment with facilities and equipment suitable for patients with severe weight problems that impact on their health and quality of life.

We offer group and individual consultations with a combination of face-to-face and virtual appointments either by telephone or video consultation.

Surgery is performed at our partnered sites including King's College Hospital. The department has close links with local primary care organisations, charities with an interest in obesity disorders and patient groups. We also have an active research team, meaning that there are opportunities to be involved in research studies using the newest treatments. 

Treatments for obesity related disorders

The centre offers the following treatments and will tailor them for you, depending on your assessment and goals.

  • Lifestyle Change – the 'south-east London healthy weight programme' is an adult weight management tier 3 service being delivered across south east London. It is a 12-month programme of group based or virtual sessions.
  • Behaviour change – delivered by a clinical psychologist.
  • Medical treatments – advised by physicians working closely with GPs.
  • Non-surgical interventions including endoscopic insertion of gastric balloons.
  • Surgical treatments including gastric band implantation and adjustment, sleeve gastrectomy and gastric bypass surgery.

Visit the NHS website for the main types of weight loss surgery

What the service provides

  • An introductory meeting where you can ask questions.
  • A full dietetic, medical and psychological assessment. The medical assessment includes blood tests, a 24-hour assessment to examine the levels of oxygen in your blood (oximetry assessment) to see if you experience sleep disordered breathing (sleep apnoea) and may involve referrals to other departments for example cardiology, respiratory or renal medicine before surgery.
  • If you are having surgery, once all the required information has been gathered, you will be booked for a surgical assessment and then the operation.
  • You will receive follow-up care after surgery from surgeons, dietitians and the medical team regularly for two years. After this you will be referred back to primary care. A referral to the weight loss clinical psychologist after surgery may be requested as well, but this will be discussed with you first. 

Weight loss surgery is not suitable for everyone, and success of surgery is heavily influenced by lifestyle and dietary changes. This is why NHS England states that you must have attended a supervised, structured weight management programme for at least 12 months before surgery.


Tel: 020 7188 1912

Email: gst-tr.Diabetes