A lot of beginner bodybuilders fail to understand that diet is probably the single most important thing in this sport. It doesn’t matter whether you’ll lift heaviest weights in the world, it doesn’t matter whether you’ll spend your money on Creatine, Protein, or any other supplements – you won’t experience quick muscle gain if you will follow a bad eating plan.
When you’re building muscle you need to make sure that your muscles are provided with all of the essential nutrients to make sure that they have enough building materials. If you’ll fail to do so – you won’t grow.