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Morendil comments on Firewalling the Optimal from the Rational - Less Wrong
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The first time I took supplemental potassium (50% US RDA in a lot of water), it was like a brain fog lifted that I never knew I had, and I felt profoundly energized in a way that made me feel exercise was reasonable and prudent, which resulted in me and the roommate that had just supplemented potassium going for an hour long walk at 2AM.
Experiences since then have not been quite so profound (which probably was so stark for me as I was likely fixing an acute deficiency), but I can still count on a moderately large amount of potassium to give me a solid, nearly side effect free performance boost for a few hours.
Thanks! Did you have any other indication at that time that you might have had a potassium deficiency, such as recent blood work?
(I had blood work done relatively recently, which turned up excessive levels of ferritin, but normal potassium at 4.2 compared to a 3.5-5.0 normal range.)
No, but I had been doing Bikram yoga on and off, and I think I wasn't keeping up the practice because I wasn't able to properly rehydrate myself.