Lean muscle requires good nutrition and a regular routine to the gym. Most of the gym trainers recommend nutritional diets that are rich in carbohydrates, high in fats and deficient in proteins. Diets with low fat and good sources of high protein are very difficult to find.
In order to get a lean muscle, you need to take in a good quantity of proteins. The human body can digest only about 30 gm of protein per meal because most of the food protein sources have long chain proteins and it takes our body a lot of enzymes to break down the proteins. Therefore, you should break down the intake of proteins between 5-7 meals throughout the day. The easiest way to do this is to use protein supplements.