According to a new study, going on a diet may improve your health, mood, and stress levels. The study involved 220 participants of whom nearly two-thirds were asked to restrict their daily calories by 25% for two years, while the other third ate whatever they wanted. Investigators found that participants restricting their calories experienced an improved mood, better quality of life, improved sleep, and better relationships than those who did not practice calorie restriction. JAMA Internal Medicine, May 2016