In the United States, 26 million adults have chronic kidney disease (CKD), which makes it harder for the kidneys to filter waste from the blood. CKD is an important health issue that can be under-recognized by patients and doctors, as it often progresses gradually with no obvious signs or symptoms until it has advanced to a late stage.  It is often linked to diabetes or hypertension, and symptoms include decreased energy, muscle cramps, and swollen feet and ankles. 

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