Slimming World is the leading diet organisation in the UK. It has 700,000 members and, at a time when obesity is spiralling in the UK, it has helped millions lose weight. It has contracts with the NHS and local government. If you meet the criteria, your doctor can sign you up for free. But could the Slimming World diet be encouraging disordered eating by some members? File on 4 hears from people who believe that Slimming World has seriously damaged their health and destroyed their relationship with food. Reporter: Josephine Casserly Producer: Immy Rhodes Technical Producer: Craig Boardman Production Coordinator: Tim Fernley Editor: Carl Johnston Image Credit: Kseniya Ovchinnikova\Getty