CORE Study - Research Into Weight Management Services in the UK

Weight management services (previously known as Tier 3 services) represent a multidisciplinary specialist approach, available in community or secondary care settings. This tier caters to individuals with a Body Mass Index (BMI) greater than 35 (or over 30 if they have diabetes) and complex medical conditions, offering pharmacotherapy, low-energy liquid diets, and pre- and post-bariatric surgery care. Tier 4 services, located within secondary care, focus on bariatric surgery. Data on obesity rates are systematically collected by the National Audit Office, enabling monitoring of Tier 1 effectiveness. Additionally, the National Bariatric Database provides insights into bariatric surgery rates, patient characteristics, and surgical outcomes. However, comprehensive data on weight management services remain scarce, with information primarily available from only 4 of the 42 weight management clinics. Consequently, it is challenging to ascertain the availability of weight management services across different regions, the volume of referrals, the demographics of individuals accessing these services, and their outcomes during treatment. This lack of data hinders our ability to evaluate equitable access, appropriate referrals, and the overall effectiveness of these services throughout the UK.

NCT Number	NCT07559409
Lead Sponsor	Society for Endocrinology
Conditions	Weight Management
Enrollment	41,000 participants
Start Date	2025-09-12
Primary Completion	2027-12-31 (estimated)
Study Completion	2027-12-31 (estimated)
Updated on ClinicalTrials.gov	2026-05-07