Realize: As we get older out kidney function does slowly decline. Think of the kidney as being made up of a million Brita filters. As we age, some of those filter stop working. If you have blood pressure, cholesterol, and/or other vascular issues even more of these filters can stop working. Be aware even your diet(as you mention) and/or muscle mass can affect this value with suggestion of a problem.
Answered 10/30/2014
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