One in five of the patients at the Mayday University Hospital in Croydon are there because of diabetes. This episode illustrates the difficulties in treating young diabetics as staff struggle to make them reconcile the seriousness of their condition with their lifestyle choices. Diabetes is fast becoming the single biggest drain on NHS resources. Treating the disease and its complications currently costs £1 million every hour, using up to 10% of the NHS's annual budget, and figures are rising rapidly. Due to increasingly poor diet and a lack of exercise, type 2 diabetes is being picked up in increasingly young patients, so much so that a new diabetic is now diagnosed every three minutes in the UK. NHS workers are potentially dealing with a ticking time bomb of young people who, at middle age, will have heart diseases and strokes, and need kidney transplants.