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?
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)
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