[joshuacc]

“Mental energy” is a pretty common phrase, and it refers to the ability to start and sustain work on tasks which require mental effort. Eating a candy bar can provide a temporary boost to mental energy, but it’s not an effective everyday approach.

There are many physical and psychological issues which diminish people’s mental energy. ADHD and depression being the most obvious.

Fortunately for many of those conditions there are also ways to increase the amount of mental energy you have available.

[db48x]

And yet this advice is not necessarily wrong. We spend a significant fraction of the calories we eat operating our brain. I have personally measured a significant increase in my ability after a good lunch compared to just an hour or two prior.