No no no no. If carbs were bad for you, the Japanese would be dropping like flies -- they have one of the highest carb diets in the world. Yet they have a higher than average life span and aren't an obese population.
Ultra-low carb diets put you into a state of ketosis in which your fat is converted into glycose. But many people on ketosis state diets just don't get enough glycose to the brain -- they think slower and are always hungry, etc.
The key is MODERATE carb intake -- not ultra low and not super high.
As has been stated. carbs have NO real food value. In my bod they convert to sugar, thus my weight gain. That explains why when I started to eat carbs again my weight shot up and my choleserol went thru the roof. I know how hard it is, I love bread and potaoes. but, they are my downfall.