Even if you’re not seriously overweight, there’s a lot to be gained by cutting back on calories, including sounder sleep, a better sex life, and more overall happiness, new research suggests. Researchers asked a group of 218 people with generally healthy weights to either reduce their caloric intake or continue to eat as they normally would for a period of two years. During that time, the participants completed detailed questionnaires about their quality of life. Those who ate normally experienced virtually no weight change, but the people who curbed calories (by 12 percent, on average) not only lost an average of 17 pounds but also reported brighter moods, better sleep, friskier libidos, and an improved quality of life. Lead author Corby Martin tells CBSNews.com that calorie restriction produces a wide range of “positive biological and physiological changes,” including lower blood sugar and improved cholesterol and blood pressure.