I don't think there is any biological need for carbs other than fiber. And sugar, well Potato said it best - it could be a doorstop. I believe that carbs have been marketed to us all of our lives, because grain is cheap. And fruits have no nutritional benefit that cannot be found in vegetables.

Physically, I feel on top of the world. I have had IBS and getting away from carbs and sugars cured it. I think the need for carbs is psychological - just my humble opinion .

Orchid