Perhaps some people prefer to excrete more dilute urine?
(As an aside for the curious, your water intake and your sodium excretion are virtually orthogonal - the body is very, very good at retaining sodium while wasting H20 when necessary. Therefore, drinking lots of water will not cure hypertension or reduce your whole-body sodium burden.)
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The widely accepted notion that we should drink 8 glasses of water per day is apparently an urban legent
http://www.snopes.com/medical/myths/8glasses.asp
Perhaps some people prefer to excrete more dilute urine?
(As an aside for the curious, your water intake and your sodium excretion are virtually orthogonal - the body is very, very good at retaining sodium while wasting H20 when necessary. Therefore, drinking lots of water will not cure hypertension or reduce your whole-body sodium burden.)
Some say that disease prevention is the best cure
http://en.wikipedia.org/wiki/Kidney_stone#Prevention