Do carbs affect our brains?

In order for the brain to efficiently transform and synthesize these valuable nutrients,it needs fuel, and lots of it.While the human brain only makes up about 2% of our body weight,it uses up to 20% of our energy resources.Most of this energy comes from carbohydrates that our body digests into glucose,or blood sugar.The frontal lobes are so sensitive to drops in glucose, in fact,that a change in mental function is one of the primary signals of nutrient deficiency.Assuming that we are getting glucose regularly,how does the specific type of carbohydrates we eat affect our brains?