If you are seriously considering about increasing lean muscle tissue, you should have a nutrition plan which consists of sources high in protein and a complex carbohydrate. Most of the carbohydrates should be consumed early in the day since they are responsible for providing energy and will help you perform all your activities during the day without feeling lethargic. You should keep the amount of refined carbohydrates to the bare minimum.
Proteins will allow you to strengthen and tone muscles more efficiently. But remember, the sources of protein you take should also have some quantity of fat otherwise it will be difficult for your body to break down the protein chains and digest them.