Carb cycling involves the ratio intake of carbohydrates, proteins, and fats in order to maximize lean muscle mass and decrease total body fat. The ratio depends on the intensity of your workout for that particular day, if any. In general, a day of high intensity workout requires a high intake of carbohydrates and a minimal intake of fats. Inversely, a day of low intensity workout or no workout requires a high intake of fat and minimal intake of carbohydrates. However, the ratio of protein intake should be always be maximized regardless of the workout intensity of that day. As a general suggestion, high and low intensity workouts should be staggered every other day or two for better results.