Nowadays, many of us are knowledge workers, and we use our brains to do the heavy lifting. The brain is a very energy-hungry organ. Of the roughly two thousand calories we consume a day, five hundred go to running our brains. That’s astonishing: the brain represents only about 2 percent of our body weight, and yet it takes up 25 percent of the energy we consume every day. It’s no wonder that the way we invest our attention is critical to whether or not we feel high or low energy.2
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