Diuretics like hydrochlorothiazide are considered super safe. But they can lead to low sodium, potassium and magnesium. Beware hot weather!
Treating dehydration may require more than plain water; a solution such as Pedialyte also supplies electrolytes.
A low-sodium diet has long been recommended to help control blood pressure, but there may be dangers in reducing salt too rigorously.
Athletes who strive to consume water even though they are not thirsty could do harm by diluting the sodium in their bodies.
Restricting salt intake severely can lead to negative health consequences.