Bad carbs are generally white in color. Think: Sugar, white flour, white bread. If you avoid "bad" carbs you may reduce your risk of type 2 diabetes, heart disease and weight gain.
"Good" carbs come from fruits, vegetables, and whole grains. Eat "good" carbs to keep your cholesterol level healthy...your blood pressure and blood sugar stable...and excess pounds off.
It's as simple as that!
(Taken from Consumer Reports on Health)