Which organ in the human body uses the most energy?
Quick Answer
The brain uses the most energy, consuming about 20% of the body's energy at rest. Even though it is only about 2% of body mass, it is the body's biggest energy user.
The Full Story
The brain is the human organ that uses the most energy. In a resting adult, it typically accounts for about 20% of total oxygen and energy consumption, despite making up only around 2% of body weight. Most of that energy supports electrical signaling, maintaining nerve cell activity, and keeping brain cells ready to process information. This is why the brain remains metabolically expensive even when you are not actively thinking hard. Its high energy demand has been a major factor in human evolution and physiology.
Key Facts
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"Your brain is tiny compared with your body — but it burns a giant share of your energy."