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I’m confused because I thought the brain liked sugars:

“The bold implication of this idea is that the effects of ego depletion could be undone by ingesting glucose, and Baumeister and his colleagues have confirmed this hypothesis in several experiments.”

Kahneman, D. “Thinking, Fast and Slow”. 2011. pg. 43, para. 2, Se. 5.

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Ego depletion was one of the key losers of the replication crisis in psych. Book was published right before the peak of the crisis. Basically it's impossible because the body can't even digest the glucose in time for the purported effect. Baumeister is also a hack who refuses to let go of the idea while others have moved on.

changelog: key example -> key losers

Ego Depletion is junk science which hasn't reproduced in serious experiments.

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