Most people don't realize but when it comes to weight-loss, dieting is actually considered by most health and nutrition professionals to be 70% of the battle. Fitness is for fitness sake, and though it plays a part in weight loss, the real source of weight loss comes from creating a caloric deficit by burning more calories then you take in and maintaining maximum efficiency in your metabolism (by eliminating sugar and unnecessary carbs). Exercise helps to increase that deficit and tones muscle and helps our physique, but is usually not enough alone to lose weight (unless you spend several hours a day doing intense activity).