You are wronger than wrong. Did you design the food pyramid that made everyone fat and sick?
The majority of your calories should come from fat, then protein, a small amount of carbs. Serious competitive athletes might need more carbs than the sedentary, but they do not need grains at all. Potatoes and fruit can give them all the carbs they need. Some dark chocolate, some wine. Period.
A diet high in carbs is a diet high in sugar.
Your body can burn either sugar or fat for fuel. If your diet is high in carbs, you will be a sugar burner and you will always be hungry. You will always crave carbs. You will be living on the brink of metabolic syndrome and preparing to be struck with any number of diseases.
What successful societies (other than Eskimos) have had their members gain the majority of their calories from fat?
You are another excellent example of how a low carb diet seems to impair cognitive function!