In addition to improving your appearance and self-esteem, it seems losing the beer belly can improve your sleep too. A study by John Hopkins University in the US has discovered that people who lose around a stone in weight and 15 per cent of their waistline sleep much better than they did previously. The research looked at 77 people who had type two or pre-diabetes who were also overweight or obese. They were randomly assigned to a group - one which went on a diet and took part in supervised exercise, and another that only took the diet. They were asked to fill out a sleep survey at the beginning and end of the study to highlight any sleep problems, whilst their body mass index and abdominal fat levels were also measured at both points. The study found that the sleep of both groups improved their sleep score by around 20 per cent, and both lost the same amount of belly fat. Kerry Stewart, professor of medicine at the university, said: "We found that improvement in sleep quality was significantly associated with overall weight loss, especially belly fat. This was true no matter the age or gender of the participants or whether the weight loss came from diet alone or diet plus exercise". So, if you are sleeping badly but also feel like you could do with losing a bit of weight, exercise really is the best medicine for both.