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WeirdlyTallDwarf t1_j6chclu wrote

Reply to comment by RixirF in ELI5: why do our bodies randomly act like we haven’t had water in days and that we need to chug a bunch randomly? by Serratedlily

This is like saying "if you're hungry, you're already malnourished/starving".

Silly, is it not?

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Aristox t1_j6coiyn wrote

No it's radically different. If you haven't eaten enough food your body will burn fat for energy. But your body has no alternative hydration source. You can go a month easy without food, you cannot go more than a few days without water and still live. And you cannot go a few hours of being lightly dehydrated without your body's performance falling below optimal

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