The Kidneys do indeed absorb nutrients contrary to the last answer. Calcium, sodium, protein (from urine), waste products from blood and even some metals are absorbed by the kidney. They do excrete most of these nutrients but not all and consequently become damaged and diseased by those they can t excrete completely. Potassium and Vitamin C are absorbed well by the body and RAS would typcially not prevent their absorption. However, the fact that you suddenly are craving these foods is probably indicative of some deficiency although your Physician would have to establish why it is occuring. Athletes with extended bouts of high exertion and physical activity tend to crave such nutrients based on exhausting the body s supply. So you could very well be low on these nutrients, but specific blood work can confirm this. Here s an excellent overview of RAS from emedicine: http://www.emedicine.com/MED/topic2001.h...
That is totally wrong. The kidneys DO NOT absorb anything out of the GI tract. They filter glucose from the blood and then absorb it back into the blood. That is a net functional zero absorption. Report Abuse
They kidneys do not absorb anything, they are the site of excretion of Vitamin C and some Potassium. Both of those are absorbed by the small intestine just like almost everything else and the gut tube isn t even connected directly to the kidneys. You must remember that it is possible to give one of your kidneys up and still live well. You normally only use about a fourth of one kidney, so having low blood flow to one of them would not make a significant impact on your body. I can t think of any way these two are linked, but let me know if they are.
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