Carbohydrates are the main fuel source for your body's functions, including exercise. Carbohydrates should comprise the greatest percentage of calories in your diet. In fact, the USDA states that carbs should equal 45-65% of your daily caloric intake. Proper carbohydrate intake also makes for more effective workouts.
While it's true that cutting carbs from your diet can be a quick fix to weight loss, it is not a long-term solution to weight-gain. A carb-free diet isn't a sustainable eating plan, nor is it recommended by most reputable healthcare professionals. In addition, most carb-free diets are high in saturated fats, which can contribute to heart disease.