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I'm still not sure why I have to drink 8 glasses of water a day.

My cardiologist told to me make sure I do. And if I don't I get dehydrated. The point is there is no time to ask.
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Noreaster · F
8 glasses is a recommendation which should vary on body weight
Everyone knows that. That is not why he told me to drink 8 glasses of water.@Noreaster
Graylight · 51-55, F
@Spoiledbrat Then why say it? Proper hydration means good fluid flow, it replaced electrolytes, it can alter your body's pH level, can aid in digestion, skin care and muscle health. It promotes proper healing and may be able to allay stress.

The 8 glasses thing is common, but it's a wholly arbitrary number utteredy one doctor. It's body weight specific, but true to be sipping something throughout the day.