Just as stated above, I would not change your diet plan unless you are directed to by a doctor or a nutritionist.
Reason being is that if you modify your diet, you run the risk of getting fat or skinny actually. You got to balance your protein, vitamins, and carbs.
You need the carbs to produce glucose. Insulin is what helps the transfer your supplements,vitamins, protein, and such to your cells. Without carbohydrates, your body will produce a product called glucagon instead of glucose. Which produces it by taking away protein from your muscles. However, you eat to much and it will be stored in the form of fat.
http://en.wikipedia.org/wiki/Glucagon
You need protein for your muscle repair obviously. And your vitamins for various functions in your body. And do not forget the pyramid, that really does help alot.
http://www.mypyramid.gov
Hope this helps!