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Tem42 comments on Nature publishes an article about alternative therapy - Less Wrong

1 Post author: BiasedBayes 19 October 2015 05:07PM

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Comment author: pjeby 28 October 2015 09:14:07PM 0 points [-]

Have you tried just drinking more on a regular basis?

Yes, but since the presence of such pains is the main thing that tells me I've not had enough, it doesn't help too much. An amount that seems sufficient can be easily overwhelmed by say, some hard work and sweating, and/or the use of the car air conditioner to recover from said hard work. Giving a talk or just having a talk with someone can do it, too. So unless I over-drink some of the time, there will always be situations where I end up under-drinking, in the absence of some finer-gauge way to tell my hydration state. I do at least know now to start chugging after I give a workshop, for example. Before I figured out the hydration link, I used to spend many painful hours recovering after each talk I gave.

Comment author: Tem42 29 October 2015 10:59:42PM 0 points [-]

You may have a bad mental model of hydration -- you should probably not visualize it as being "I need 100 ml of water an hour to be perfectly hydrated". Your body can easily handle an extra cup of water without trouble, and has multiple buffer systems. If you are thirsty enough to gain any pleasure from drinking, drink. (Warning, this advice does not apply to alcohol and soda).

It is possibly relevant that blood pressure is related to hydration -- when your blood pressure goes up, your body reduces blood volume by removing some water from your bloodstream. If you find talks stressful and this raises your blood pressure, you may become slightly more dehydrated, and following this, when your blood pressure decreases, you will be "underblooded" -- which is to say, your body will have to get some water from somewhere to increase blood volume, or you will have less than ideal blood pressure. (This is a simplification). If this is a significant cause of your headaches, you might notice a correlation between having to pee (water is removed from the bloodstream into the bladder) and having a headache. However, it would be hard to test this correlation in an unbiased fashion.

Comment author: pjeby 30 October 2015 04:04:35PM 1 point [-]

Your body can easily handle an extra cup of water without trouble ... If you are thirsty enough to gain any pleasure from drinking, drink.

Beware the Typical Bladder Fallacy. ;-) (Or just the typical body fallacy.)

You seem to be assuming that I don't already force myself to drink water to this extent. I do. The problem is that there is no sensation that tells me I am "thirsty enough", most of the time. Or more precisely, there is very little correlation between my sensation of thirst and my level of dehydration. I can be thirsty and not dehydrated, but I can also be dehydrated and not thirsty, and slip from one state to the other without noticing. This means I have to use a drinking habit as a workaround, and also check for symptoms like nasal congestion.

If you find talks stressful and this raises your blood pressure

It doesn't matter what the subject matter is, or whom I'm speaking with; what matters is the total time I spend with my mouth open; I salivate profusely and presumably lose quite a bit to evaporation. Likewise, I sweat profusely from almost any amount of physical exertion. In general. In general, my body always acts as if it thinks it has plenty of water and should get rid of it ASAP, at least with respect to those systems that acquire or eliminate water.

Water conservation systems, on the other hand (like my nasal mucus and digestive tract) do seem to notice that I am dehydrating and act to conserve water!

So in general, I notice that my body is confused. ;-) Unfortunately, I'm not yet aware of any means by which I may resolve its confusions about water.