Bariatric and Obesity Surgery

Bariatric and Obesity Surgery

Main Address

  • Outpatient consultations
    Clinic 4A and 4B
    Outpatient department
    Whittington Hospital
  • Appointments: 020 7288 5511 / 5512
The bariatric service at the Whittington Hospital is known as the North London Obesity Surgery Service (or NLOSS). The Whittington Hospital has been providing bariatric surgery since 1998 and is one of the most established providers of such services in the UK.
At NLOSS, we undertake Gastric banding, Roux-en-Y bypass (gastric bypass), Single Anastomosis Gastric Bypass and†Sleeve gastrectomy as well as revision surgery.† All operations are performed laparoscopically (keyhole surgery), which will help you to get up and around and back to normal†very soon†after surgery. At present we undertake up to†eight operations a week and will be performing greater numbers throughout 2016 as our service expands.
One of the mainstays of the NLOSS is†our multidisciplinary team. Each team member has his or her own role and all together we ensure you are fully informed about weight loss surgery and that your operation is performed in the safest possible environment. Your safety is our first priority.

Opening Hours

Monday to Friday
9am - 5pm


Referrals can be made via your GP.

Range of services

  • Gastric banding (LAGB)
  • Roux-en-Y Gastric Bypass (LRYGB)
  • Single Anastomosis Gastric Bypass (SAGB)
  • Sleeve gastrectomy (LSG)
Medical (prior to surgery)
  • Supervised dieting and medication
  • Special diets - †e.g. Whittington POWeR Diet, Cambridge Diet, Slim fast
  • Supervised physiotherapy
Psychological (prior to surgery)
  • Eating Disorder Evaluation
  • Self-help group for correction of eating disorders†such as†binge eating
  • Cognitive behaviour therapy (CBT)
  • Treatment of existing mental health issues such as depression and schizophrenia

General Enquiries

0207 288 3408 (Bariatric Patient Pathway Co-ordinator)


020 7288 3071 or 07769 926527


If patient's do not attend appointments, they may be discharged back to their GP. This will allow other patients the opportunity to† undergo treatment.

Further Information

Lorna Antoine
Bariatric MDT Co-ordinator (020 7288 5226)
Laura Yevu Umba
Bariatric & Upper GI Nurse Specialist (020 7288 5846)
Naiara Fernandez-Munoz
Bariatric & Upper GI Nurse Practitioner (020 7288 3071)

Cleverly Fong
Bariatric Dietitian (020 7288 5989)
Maria Lough
†Bariatric Dietitian (020 7288 5989)†

Some interventions may require travel to Central Middlesex Hospital or St Annís Hospital as a part of our joint service.

Key staff

Mr Ali Alhamdani

Mr Ali Alhamdani


Mr Mohammad Howlader

Mr Mohammad Howlader

Consultant in General Surgery

Mr Chetan Parmar

Mr Chetan Parmar

Consultant in Upper Gastrointestinal and Bariatric Surgery

Mr Pratik Sufi

Mr Pratik Sufi

Consultant in Upper Gastrointestinal and Laparoscopic Surgery

The North London Obesity Surgery Service
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