your brain has the ability to process the information…

Keyword thought your brain has the ability to process the information that it takes in for multiple sources but it does so at a cost. This cost is that the brain gets tired as well as the brain has trouble separating the trivial from the important. Every status update on Facebook or tweet on Twitter takes energy from your brain.

— from Fuel (Energy)

In the book

Refuel the physical tank first, because it carries the others. Move your body — exercise is the fastest way to alter a depleted state and sharpen the mind; when the gauge spikes into panic, take four or five long, slow belly breaths, which calm the whole system at the source; and never undervalue sleep and food, the plainest refuelers there are. Spend the mental tank on purpose. Attention is the single most essential mental resource you have — it decides what you even notice, and your brain processes everything at a real cost, so automate the small, repeated decisions to save the fuel for the ones that matter. In most choices the goal is not the perfect answer but a good-enough one — spend only the energy the decision truly warrants — and let well-built habits run themselves, since a little useful mindlessness frees the mind's scarce fuel for what truly needs it. — Fuel (Energy)

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