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Your brain is gluttonous! Though your brain comprises only 3% of your bodyweight, it receives 30% of the blood that is pumped by your heart.

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Interesting fact:

So, the brain is greedy in the sense that it requires a great deal of the blood supply in comparison to other parts of the body. Dr. Bennet Omalu stated, “the brain is like a spoiled and demanding child, but yet it is extremely smart and efficient.”