We still want you to hydrate before and after running, but it's important to be aware of the problems caused by too much hydration. A 25-year-old police officer in Washington D.C. died after drinking as much as 3 gallons during his 12-mile bike patrol yesterday.
According to the Washington Post story, "Many experts believe hyponatremia has become more common in recent years. More people are engaging in endurance events, such as marathons, that last many hours and during which participants are urged to drink water.
The blood concentration of sodium is normally about 145, measured in millimoles per liter. A study published in April in the New England Journal of Medicine found that in a random sample of 488 Boston Marathon runners, 22 percent of women and 8 percent of men had sodium levels below 135, the formal definition of hyponatremia. One participant, a 28-year-old woman, died of the condition."
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