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gwern comments on What are you working on? April 2012 - Less Wrong
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I don't think that'd be much of a surprise if you read much literature on exercise - exercise improving mood & cognition is a pretty common result.
Or vice versa? (I feel very hungry on modafinil - does hunger cause me to use modafinil?)
You do? It's supposed to have the typical appetite-suppressing properties that most stimulants share.
Yes, that's the problem - my appetite is initially suppressed and then I wind up incredibly hungry. I try to eat in advance (from my nightwatch days I know how much I should eat by 3 AM etc), but again, appetite suppressant.
That makes sense. And given how degree of hunger influences what kind of food we desire you'll end up craving a bunch of carbohydrates later rather than whatever healthy food you had planned at the meal times.
FWIW, I feel pretty hungry on modafinil, too. But that's maybe caused by sleep-deprivation which is correlated with modafinil-consumption.
I knew of the literature you mention (well, not the specific literature, but that's not the point) - which is precisely what caused me to look at it - but I thought other factors would still be more correlative. I would have thought sleep, stress, recreation time, or social time would be more predictive. But those barely correlate.
I quite intentionally didn't say one caused the other. But I wouldn't expect the primary causality to flow from energy to eating, as opposed to from eating to energy. (Or, yes, from a common third cause)