On hot summer days, when I drink water to quench my thirst, my body immediately responds by sweating in 5 to 10 seconds or maybe less. How does our body detect the presence of water in the stomach so fast. Does our body detect the sudden decrease in temperature of the stomach or is it by some other mechanism. Why do we sweat after drinking water in the first place. Is it to remove the excess water or to cool the body down on a hot day?

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    $\begingroup$ interesting biology experiment: lemon balm is one of the most comment garden herbs, that looks a bit like mint, and that grows in most gardens and wild. If you drink it in a tea, it causes immediate sweating. check wiki if you want. I tried some on a hot day and i was immediately cooled by profusive sweating. cool. anniesremedy.com/diaphoreticsudorific-property-39.php $\endgroup$ – com.prehensible Sep 25 '18 at 13:26

Two things causes Sweating (immediately or within few seconds after having Water)

1) Your were dehydrated 2) Excess warm water in your stomach or body

When dehydrated, your body stops sweating to keep liquid in your body. So when you have water the body immediately observes the water and starts swaeting.

And when you consume excess water (if its hot you will sweat)

Edit: Human brain works faster than computer machine, and so when you drink water
"endorphins" group of harmones in brain will indicate the hydration level and it works through human nervous system

Reference - https://en.wikipedia.org/wiki/Perspiration#Causes

  • $\begingroup$ Your answer (1- dehydration) answers the why part of the question. But the main question is how does my body detect that we I am drinking water. This happens within a few seconds and I don't think the water I drink can be absorbed by the stomach into the bloodstream that quickly or is can it be? I don't understand how warm water in my stomach can explain this $\endgroup$ – Kevin Selva Prasanna Sep 25 '18 at 14:42
  • $\begingroup$ @KevinSelvaPrasanna how did you know you were drinking water? You are your body. The brain is not a separate part. $\endgroup$ – De Novo Sep 25 '18 at 14:51
  • $\begingroup$ @KevinSelvaPrasanna, edited the answer explaining it. You can also refer to wikipedia to know more about endorphins and human nervous system. $\endgroup$ – V BHARATH KUMAR REDDY Sep 25 '18 at 14:58
  • $\begingroup$ @DeNovo Are you saying that the conscious brain is what that detects the presence of water in the stomach. Does that mean feeding an unconscious thirsty man water will not make him sweat? $\endgroup$ – Kevin Selva Prasanna Nov 12 '18 at 10:54
  • $\begingroup$ @KevinSelvaPrasanna no, I'm saying there are many components to reflex and other actions. The question "how does my body know x" is often a question beginning students ask because they have a conceptual model of the body as a simple machine and their consciousness as an entirely different entity. When this question is asked, it is not odd to the questioner that they will know when they drink water, because they execute the action, see it, and feel it. All of these processes are part of the body and the production of sweat is under central control. $\endgroup$ – De Novo Nov 12 '18 at 16:24

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