Building muscle mass is not only about going to the gym and lifting. There is an important rule to remember: eating for muscles is just as important as lifting. Combine training with eating well.
But how do you make sure you eat enough to build muscle? First, you need to know how many calories you need in rest mode. You do that by calculating your Basal Metabolic Rate. Then you make sure to eat more than this. Keep track of the results. If you are training, but your fat levels are going up, lower your caloric intake. If you stay slim, but do not make any progress in the gym (and thus not gaining muscle mass) make sure you eat more. The most accurate way to measure muscle and body fat levels is using a body composition monitor.
What you eat is also important when trying to gain muscle mass. Keep track of the ingredients you are consuming: not only the amount of calories, but also the nutrients in them. In general: eat healthy, varied, eat often and avoid junk food.
To build muscles, your body needs protein. Therefore it is important to include lots of proteins in your new diet. Think about products like chicken, turkey, yogurt, beans, nuts and different kinds of fish. However, don’t forget you also need carbohydrates and healthy fats. Keep your diet varied and eat enough vegetables in addition to the protein-rich food in order to gain muscle.
Other important factors to gain muscles are: