To put some numbers on that, USA brains directly consume 20W × 330M = 6.6 GW, whereas the USA food system consumes ≈500 GW [not counting sunlight falling on crops] (≈15% of the 3300 GW total USA energy consumption).
To put some numbers on that, USA brains directly consume 20W × 330M = 6.6 GW, whereas the USA food system consumes ≈500 GW [not counting sunlight falling on crops] (≈15% of the 3300 GW total USA energy consumption).