Low Carb vs. High Carb or Both?

I have been basically on a low carb diet for a long time now. What are the benefits of throwing carbs into your diet? I am looking to stay lean and fit, will this throw me off? Should I have low carb days and high carb days? Would I have better lifts? Basically any information about adding carbs to a diet…

I just bought whole wheat pasta, whole grain bread, and some other things. I figured I would give carbs a try.