The carbohydrate type diet as presented by The Metabolic Typing diet does not suggest you eat the "white" carbs that the American diet entails. Rather it says that type does better on a diet that contain more carbs than a protein type. It also says that a carbotype may tolerate the "white carbs" better than most.

I have to disagree that all people are metabolically the same. We cannot take our own experience and extrapolate it to everyone else's. That's been the problem with most diets and diet gurus. They find something that works for them and say everyone can lose on their WOE. Further, I know plenty of people who are and have been healthy on diets with more complex carbs and tolerate "white" carbs better than I and others. And they have no health problems either. It's when the diet is not properly balanced (and I don't mean like the USDA food pyramid) for a person's metabolic type that problems arise.