The extra calories are required for rebuilding the muscle tissues which can be lost or damaged through the high intensive workouts. The simple way of eating just as much as you'll need isn't the optimal way for muscle gain. The same kind of calories might not be suitable for another individual. Your body are only able to process certain quantity of calories consumed during a period. If you think that avoiding drinking throughout the workweek but spending an evening in the party at weekend drinking a lot is not any matter, your idea is not true. You can consume over 1,000 calories from drinking (wine, beer, soda, etc) and eating (chicken wings, pizzas, peanuts, etc). It means you will get extra unexpected pounds. If you think that avoiding drinking in the workweek but spending per night of the party at weekend drinking a great deal is no matter, your idea is not true. You can consume over 1,000 calories from drinking (wine, beer, soda, etc) and eating (chicken wings, pizzas, peanuts, etc). It means you might get extra unexpected pounds.