It really all depends on what you eat. If you eat a lot of spinach it will come out dark green and if you eat some Oreos cookies it will come out black but that all depends on how many you eat. You've heard the saying " you are what you eat.
Why are you whatever skin color you are? Why are you human? Why are you here? Why are you alive? Why is earth here? Because potato that's why. Worship potatoes and you will find the answer to life's great mysteries.