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What is the brain composed of?

Dr. Michael Roizen, MD
Internal Medicine
Weighing just three pounds, your brain is the most complex and least understood part of your body. About 80 percent of your brain is actually water, but the rest of it is taken up by both physical and biochemical structures. Although it's not an extraordinary organ in terms of size, it is in terms of power.

Picture of section of brain
YOU: The Owner's Manual, Updated and Expanded Edition: An Insider's Guide to the Body that Will Make You Healthier and Younger

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YOU: The Owner's Manual, Updated and Expanded Edition: An Insider's Guide to the Body that Will Make You Healthier and Younger

Between your full-length mirror and high-school biology class, you probably think you know a lot about the human body. While it's true that we live in an age when we're as obsessed with our bodies as...

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Important: This content reflects information from various individuals and organizations and may offer alternative or opposing points of view. It should not be used for medical advice, diagnosis or treatment. As always, you should consult with your healthcare provider about your specific health needs.