The benefits of drinking water is not just quenching thirst - it can keep you alert and regulate your blood pressure too, says a new study.
David Robertson, and colleagues at Vanderbilt University Medical Center first observed this property about 10 years ago, in patients who had lost their baroreflexes - the system that keeps blood pressure within a normal range.
Water increases the activity of the sympathetic - fight or flight - nervous system, which raises alertness, blood pressure and energy expenditure.
American Red Cross found in a study, that drinking 16 ounces of water before blood donation reduced the fainting response by 20 percent.
And because it raises sympathetic nervous system activity - and consequently energy expenditure - it does promote weight loss, Robertson said.
The study is reported in the June issue of the journal Hypertension.