Can someone hydrate too much?
Taking in too much water and not enough sodium (which we mainly get from food) could result in a condition called hyponatremia, which causes headaches, weakness, fatigue, nausea, light-headedness, muscle cramping, seizures and even coma. But it is not common (some experts think the condition only affects endurance athletes), so staying hydrated when you work out is the more important concern. Exercisers may be at greater risk for hyponatremia in hot environments, because the heat increases thirst and decreases appetite. If you’ve consumed more than three liters of water on a relatively empty stomach and are not sweating enough, you could be at risk. If you notice symptoms, stop exercising and have a salty snack and a sports drink; call your doctor if your condition worsens.
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