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On average, your body uses around 1,500 calories a day in a resting state. And your brain consumes about 20 percent of those. That's roughly 300 calories a day and about 12 calories every minute!

So if your brain is 3 pounds, over two of those pounds of are water weight. Water is essential for delivering nutrients and removing toxins within the brain. It also acts as a shock absorber for both the brain and the spinal cord.

That's about 2 percent of your total body weight. Men tend to have larger brains than women, but in general, brain size doesn't translate to intelligence. And for additional information on health and more, sign up for our daily newsletter.

Your brain gets top priority when it comes to blood distribution within the body. That's because without a steady supply of oxygen-rich blood, brain cells will begin to die after as little as one minute. And speaking of oxygen, check out 17 Warning Signs Your Lungs Are Trying to Send You.

That's roughly half the number of stars in our galaxy. Neurons, also known as nerve cells, are responsible for sending and receiving signals from the brain. And for ways you can keep your mind sharp, check out 15 Brain Games That Will Make You a Smarter Person.