YES, your brain is always hungry.
The brain, which accounts for 2 percent of our body weight, requires about 20 percent of our daily calories (Example: a healthy daily calorie intake is 2000 calories, so your brain is going to eat 400 of those calories). The brain needs a constant supply of glucose because neurons cannot store it. The brain works best with about 25 grams of glucose circulating in the blood stream, about the amount found in a banana. Best sources of carbohydrates for the brain are; fruits, vegetables, and grains.
So, next time you consider limiting you calories or ‘counting calories’ consider your brain wants to eat too!