The idea behind that is that you can improve your

[Maria Pollard]

The 21 Day Fast Mass Building program works on a cycling method for calories. The idea behind that is that you can improve your muscles through nutrient depletion. You would consume less carbs in order to make your muscles hungry so that when you start eating normally again, or maybe even overeat, your muscles are ready for the nutrients and use them efficiently enough to grow faster.

Note that you should intake more calories in form of fresh vegetables and not in form of fast and junk food. Your body will need more energy while working out so if you miss proper diet then you'll end up hurting yourself. Be strict and stick to Muscle Building Review your diet.
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