Thirst

Of course thurst comes from needing water. However this doesn't seem to be the only factor. I have been getting insatiable thirst after taking more vitamins and minerals especially magnesium. This sensation seems to be lessened by taking potassium. So perhaps a high magnesium/potassium ratio is used in derermining thirst level. This makes sense because foods high in water are usually better sources of potassium. Also dyspnea or air hunger is caused by bacteria infection so perhaps thirst can be hacked by bacteria as well.

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