(Vanderbilt University Medical Center) Researchers at Vanderbilt University Medical Center have shown that ordinary water – without any additives – does more than just quench thirst. It has some other unexpected, physiological effects. It increases the activity of the sympathetic – fight or flight – nervous system, which raises alertness, blood pressure and energy expenditure.
David Robertson, M.D., and colleagues first observed water's curious ability to increase blood pressure about 10 years ago, in patients who had lost their baroreflexes – the system that keeps blood pressure within a normal range.
The observation came as a complete surprise, said Robertson, professor of Medicine, Pharmacology and Neurology.
"We had to unlearn the idea that water had no effect on blood pressure, which is what all medical students had been told until the last couple of years."
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