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It takes between 2-4 hrs for food to leave the stomach & it takes less time with water; absorption of water takes approx. 30 min. [ Source: http://www.chacha.com/question/how-long-does-it-take-the-body-to-absorb-water ].
The study gave 36 volunteers 300 mL of ordinary bottled water, âlabelledâ with deuterium (an isotope of hydrogen than contains a proton and a neutron instead of just a proton) to allow the researchers to track how much of that specific gulp of water was found at different places in the body. They found that the water started showing up in the bloodstream within five minutes; half of the water was absorbed in 11-13 minutes; and it was completely absorbed in 75-120 minutes. Hereâs what the data looks like: On the left, it shows how quickly the water was absorbed in the first hour, measured in the blood. On the right, it shows the gradual decay of deuterium levels over the subsequent 10 days, measured from urine samples. This, of course, shows that when I pee after drinking a glass of water, Iâm not peeing out the same glass of water!