Multiple choice general knowledge science & technology

How much of the food you eat is used to run your brain?

  1. A tenth

  2. A fifth

  3. One half

  4. None
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The brain consumes approximately 20% (one-fifth) of the body's total energy intake, despite representing only 2% of body weight. This is because neurons are extremely energy-intensive, constantly maintaining electrical gradients and transmitting signals. The brain runs almost exclusively on glucose and cannot use other fuels effectively.

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