Carbohydrates are one of the most important nutrients that anyone, who workout, should pay attention to. Carbohydrates are the main source for energy in both aerobic and anaerobic training, they are regulator of blood glucose and glycogen replenishment. In addition, the right amount of carbohydrates provides complete oxidation of fatty acids, which is supporting the process of weight loss, as well as it reduces the muscle acidification. With the deficiency of carbohydrates, the body begins to digest its own tissues to obtain the so-called glucogenic amino acids, and thus leads to the undesired for most of working out people effect: increased catabolism. The dose of carbohydrates and also dietary fiber, plays a very important role of regulatory, safety, and health-promoting agents.