By Band Sleeve Home

Follow up study

The By-Band-Sleeve study has been completed. We now need to follow up everyone to see how things are in the longer term. We would love you to be involved.

Please complete online the ‘Expression of Interest’ consent form.

Note this is for people who were part of the original By-Band-Sleeve Study.


You are invited to the By-Band-Sleeve study results webinar

We are holding a webinar to present the results of the By-Band-Sleeve study. If you wish to join please register by clicking the corresponding link below:

7th November 2023 at 12:30pm

The panel will present the results of the study and then they will be available to answer any questions you may have.

Please note, the first webinar was held on the 17th October 2023 and the panel presented the same results as those shown in the November meeting.

We expect the webinar to last no more than 50 minutes (though if there are lots of questions then the panel would be happy to stay to answer them).

Panel Members:

Jane Blazeby: Study Lead

Karen Coulman: Dietitian

Marianne Hollyman: Bariatric Surgeon

Nicki Salter: Bariatric Nurse Specialist

Jodi Smith: Patient Representative


By Band Sleeve Study Results Newsletter

BBS Patient newsletter Issue 9 v1.0



About the By Band Sleeve Study:

What we know and what we don’t know about bariatric surgery

Obesity is an increasing health problem in the UK. Current national guidelines recommend that surgery is considered for people living with obesity. This surgery is known as bariatric surgery. Three of the most common types of bariatric surgery operations are:

  • adjustable gastric band (‘Band’)
  • Roux-en-Y gastric bypass (‘Bypass’)
  • gastric sleeve (‘Sleeve’).

At the moment, health professionals do not know which of these three operations is the most effective for long-term weight loss and improvement of health problems and quality of life.

In January 2016 the By-Band-Sleeve study was selected by the National Institute for Health Research (NIHR) as part of their BIG Challenge campaign to highlight studies which are involved in obesity-related research, from the perspective of the patient and the researchers. 

Can I take part?

The By-Band-Sleeve study that includes patients undergoing the three different types of surgery has now completed recruitment and follow up and therefore we are not accepting any new patients for this study. We are currently analysing the results collected from over 1300 participants. If you wish to undergo bariatric surgery you will have to proceed through the standard NHS patient pathway processes.

Study Team

Above is the By Band Sleeve study team. This photograph was taken at our annual Investigators’ Meeting in November 2019. To find out more about the study team follow these links: University of Bristol Team, Clinical Leads, University of Oxford & University of Birmingham.

Study Status

In late September 2019 the By Band Sleeve study completed recruitment and entered the follow up phase during which data on patients was collected through visits to their recruiting hospitals and via online or postal questionnaires. The study reached its target of 1341 patients consented and randomised. The follow up phase ended in September 2022 and the results are currently being analysed. To find out more about the follow up phase visit here

Covid Update – September 2020

The By Band Sleeve study was in the follow up phase during the UK lockdowns resulting from the Covid-19 pandemic. This meant that the study operations at the coordinating centre  never stopped, despite the study team moving to a working-from-home status. Contributing hospitals across the country  continued their follow up appointments by telephone and video clinics and the coordination team  kept in close contact with our study colleagues across the country throughout the pandemic.

In September 2020  bariatric surgery resumed  across some hospital Trusts in the UK. We are in close communication with all of the research teams in these centres to ensure that any remaining surgeries are scheduled to take place as soon as possible. We are also working hard to ensure that face-to-face visits can start again either in hospital or at patients’ homes. We are keen to ensure that this is done in a fully approved and safest way for patients. Further information and updates will be available from your local research team.