[gattaca]

I agree with your dad, white flour, white sugar, even cocaine, are concentrated extracts, white rice has the bran removed.

[Signalman]

While eating vegetables and berries and some whole grains is healthful, humans do not require carbohydrate at all to be healthy, only protein and fat.

“Despite oft-heard claims to the contrary, there is no actual physiological requirement for dietary carbohydrate.”

http://www.bodyrecomposition.com/nutrition/how-many-carbohydrates-do-you-need.html