Research conducted by Dr John Berardi and the Precision Nutrition team has proven what a lot of fitness professionals have been saying for years - increasing your exercise AND the amount of food you eat improves your body composition. People who did this all saw dramatic improvements in resting metabolism, lean muscle mass and reductions in body fat.
The interesting fact is that the reverse doesn't work! If you decrease your calorie intake, and decrease your activity level you simply lose muscle and get fatter. So restriction is a myth, you should never be going hungry and you need to get more active - so eat more and move more!