Why when you drink water when you’re really thirsty you feel better/hydrated instantly but in that moment hydration hasn’t even started?
In: Biology
Here’s something cool to know even if it’s a tangent from the poster’s question: hydration already began before you even drank the water.
Water balance in the body is mainly controlled by a hormone called Vassopressin [or AVP]. Basically, this hormone is released from the brain when the body is either low in volume (hypovolemic or hypotensive) or too “salty” (or high in electrolytes). What it does is it reabsorbs water in the kidneys to combat dehydration. Since kidneys function 24/7, there’s always water to reabsorb.
The brain releases this hormone at a lower threshold compared to the brain recognizing the body is thirsty. So, even without realizing you’re thirsty, the body is already reabsorbing the water your kidneys are filtering.
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