If the brain uses up 20% of the calories we consume,?

Question

then is their a way to make the brain burn more calories as a form of weight loss

Answer 1

Not really.  All parts of the body consume energy in just staying alive.  An active brain might consume marginally more calories than when you are in deep sleep, for example, but the only two ways to really lose weight are to eat less and exercise more.

Boring but true.

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Answer 2

The brain uses energy, thinking doesn't.