What gives a brain energy?

Answer 1

the food which we eat gives the energy to the brain

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I cannot agree with this one. This would mean that if we eat the same food, then we all should have the same brain energy. This is not the case never mind what we eat.

Definitely there is something else that gives the energy to our brains. I'd say that our brain cells are capable of acquiring the energy from universe. So, different cells bind different energy and that's how we are different.

How that process wroks, ohh, well, I'd like to learn about it too.