Workout carbohydrates are very important for increasing lean muscle mass, without consuming workout carbohydrates our bodies will not have the fuel they require for completing a workout or the energy required to add on new muscle mass. In any diet it is important to monitor the amount of carbohydrates you are consuming, and when trying to add new muscle mass it is important to make sure you are getting enough to stimulate new muscle gains.
Post workout it is essential to take a fast acting hi GI workout carbohydrate. It will help you protect your post workout protein from being converted and used as energy by the body, and save it for being used primarily for repair and restoration of muscular mass. Additionally it will help with spiking your insulin, a trigger that your body relies upon to stimulate new muscle growth.
Additionally use a carbohydrate supplement throughout the day if you struggle obtaining adequate carbohydrates through the food you consume.