Usually when he trains in the gym looks improve fitness, increase muscle mass of arms, abdomen, legs, buttocks back. However not all achieve the desired purpose. To increase muscle mass, it is not necessary to exceed in physical training, or consume large amounts of proteins, much less use anabolic steroids. One of the mistakes most common in athletes who seek to increase their muscle mass r, is believing that a high intake of protein is needed. While it is true that these nutrients are used by the body to build tissues, it is also true that the consumption of protein by itself does not provide the desired result and if it exceeds its consumption can represent true risk to health. Proteins have a key role in the increase of muscle mass but the necessary caloric intake during sports training makes that proteins are transformed by the body and used as fuel, not to generate tissues. What you should do is increase the amount of carbohydrates that help the caloric intake and thus allow that proteins are actually used in the generation of tissues and very minimally in calorie consumption. The protein requirement of the body to be used in generation of tissues is typically 1.5 to 2 grams daily for each kilogram of body weight. As important as the proteins are carbohydrates which combined help the muscle formation and completed physical activity prevent wear that leads to loss of protein. Carbohydrates increase blood volume of insulin, which is a hormone needed for muscle development and other tissues of the body.