There is an epidemic of type 2 diabetes in younger adults. These patients are at very high lifetime risk of heart-related complications. Subtle heart abnormalities can be present even at a young age in these patients and may predispose them to heart failure and ultimately premature death. There is emerging evidence that type 2 diabetes can be reversed with weight loss. We propose that weight loss can also reverse the fatty changes seen in the liver and heart in these patients, and in turn lead to improved heart function. This project aims to identify how type 2 diabetes causes changes in the heart in young people with type 2 diabetes by performing detailed scans and other tests of the heart's structure and function. In addition we will attempt to see if the heart's pumping function can be improved, either by a weight loss program with a special low calorie diet, or by a structured program of exercise. This will be compared with the usual standard diabetes care. As well as looking to see if the heart's function can be improved with the intervention, we also aim to identify what the mechanism of any improvement would be. We suspect that changes in the amount of fat within the liver and the heart may be responsible, and will measure these at the beginning, end and in some patients halfway through the study to explore possible mechanisms amongst other clinical variables (e.g. HbA1c)