To investigate the general effects of increased fluid intake, the researchers examined data from a study involving 141 healthy men aged 55 to 75 years. In random order they were either advised to increase their water intake by a liter and a half per day, or were given a spoonful of a placebo syrup per day.
　　
    After 6 months, the men urged to drink more water had managed to boost their daily fluid intake by an average of about a liter per day. There were no significant differences between the two group in blood pressure, sodium level or the filtration rate of the their kidneys.
　　
    The researchers thus conclude that the advice to increase fluid intake had no negative effects.
　　
    Summing up, Spigt added, "It seems unreasonable to worry about the harmful effects of drinking extra water." However, he warned, "This does not mean that one cannot drink too much. Excessive intakes of water -- more than 10 liters -- can be harmful."

 

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