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  1. #1
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    Smile Leaching Potatoes

    It has been shown in a scientific study that leaching potatoes before has no effect on the Potassium in potatoes. May I suggest that the DaVita resipes be updated to delete the recommendation. It is better to cube or thinly slice the potatoes, and this reduces the Potassium by at least 35% during boiling

    See: The Effects of Boiling and Leaching on the Content of Potassium and Other Minerals in Potatoes
    P.C. BETHKE and S.H. JANSKY
    Authors are with USDA-ARS and Dept. of Horticulture, Univ. of Wisconsin-Madison, Madison, WI 53706 U.S.A.

  2. #2
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    Lightbulb Re: Leaching Potatoes

    Are you talking about this article?

    http://www3.interscience.wiley.com/j...TRY=1&SRETRY=0

    ABSTRACT: The white potato (Solanum tuberosum L.) is a valuable source of potassium in the human diet. While most consumers benefit from high levels of potassium in potato tubers, individuals with compromised kidney function must minimize their potassium intake. This study was undertaken to determine the effects of leaching and boiling on levels of potassium and other minerals in potato tubers. Leaching alone did not significantly reduce levels of potassium or other minerals in tubers. Boiling tuber cubes and shredded tubers decreased potassium levels by 50% and 75%, respectively. Reductions in mineral amounts following boiling were observed for phosphorus, magnesium, sulfur, zinc, manganese, and iron. There was no difference between the leaching and boiling treatment and the boiling treatment. In addition, mineral levels in tubers of 6 North American potato cultivars are reported. Significant differences in mineral levels were detected among cultivars, but they were too small to be nutritionally important. Individuals wishing to maximize the mineral nutrition benefits of consuming potatoes should boil them whole or bake, roast, or microwave them. Those who must reduce potassium uptake should boil small pieces before consuming them.
    MS 20070969 Submitted 12/26/2007, Accepted 3/12/2008
    I don't see anywhere in there were it says leeching doesn't work .. but that it ALONE is not enough. Frankly people don't do it right a lot of times. You can't just put a whole unpeeled potato in a pot and let it sit in there and then use that same water and hope your meal will be Potassium free! The proper way to Leech potatoes is this:

    Q: I have a kidney problem and would like to know how to leech potatoes of some of their potassium. Do you have any answers?
    A: According to health facilities such as the Brigham & Women's Hospital in Boston, this is the recommendation for preparing and eating potatoes when on kidney dialysis. If you are going into failure and are yet not on dialysis, it is best to check with your doctor before eating potatoes. Peel, cube and soak potatoes in a large amount of water overnight. The amount of water should be at least five times that of the potatoes. Drain them the following day and boil in fresh water for at least one hour, longer if possible. You then can serve them plain or mashed with margarine. Potatoes cooked in this manner are allowed twice a week on non-consecutive days for patients on kidney dialysis.

    http://www.potatoes.com/QandA.cfm Marjorie Geiser helps busy professionals sift through the overwhelming information on health and fitness and learn how to apply it to their own lives. She is a nutrition consultant for the Washington State Potato Commission, a Registered Dietitian, Personal Trainer and Life Coach. To learn more about her services, go to her website at www.megfit.com or email her at margie@megfit.com.
    Make sure the potatoes are cut into cubes to successfully leech out as much Potassium as possible.

    "Peel potatoes and cut them into cubes no more than 1 1/2 inches square. Place them in a large container and cover with water 4 times the volume of the potatoes. Cover and refrigerate for at least six hours. Change the water at least once. It is better to allow a longer soak and to change the water twice." DaVita Diet Pamphlet

    Also a medium potato has about 900 mg of potassium with the skin and it goes down to about 500 mg without the skin. Ditch those skins!

    Perhaps instead DaVita needs to clarify for better understanding on the recipes page.

    I see what you mean.. found it clarified here:

    Leaching, which refers to soaking food in water before cooking, had little effect on the mineral levels of the samples. Because leaching alone was an ineffective method for reducing potassium content, there exists little benefit for renal failure patients trying to reduce potassium consumption by leaching potatoes.

    Those with compromised kidney function can decrease their mineral intake while still taking advantage of the other nutritional qualities of potatoes by boiling them, thinly sliced. This method will remove a large quantity of many minerals, including potassium. It is not necessary to complicate the process by leaching potato slices before boiling them.

    http://www.medicalnewstoday.com/articles/109294.php
    Angie
    Kidney KornerDialysis Ethics Forum Kidney PixAwareness Shirts KidneySpace Donor Search
    I will be walking a Kidney Walk in Ontario Canada Sept 18th 2011

    • Peritoneal Dialysis = 4 yrs
    • Hemo Dialysis (in center) = 2 yrs
    • 2 kidney transplants = 1990 - 2001 & 2007 to present

  3. #3
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    Re: Leaching Potatoes

    Davita has very clear information on how to properly leach potatoes including results from studies that span many years. At least the last time I looked the info was there; that was about 2 mo's ago. It does say that the most effective way to reduce potassium is to dice into tiny pieces and boil. Perhaps you have not completely read the entire story on davita.com. It is worth another look to get the proper info.

  4. #4
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    Re: Leaching Potatoes

    The paper says that “leaching alone does not significantly reduce potassium content.” This implies that something else needs to be done, and that leaching is not required. It does not mean, IMHO, that you need to leach and do something else. Others have come to the same conclusion. Look at these quotes:

    There was no difference between the leaching plus boiling treatment and the boiling treatment.” USDA Agricultural Research Service. March 2009.

    “Those with compromised kidney function can decrease their mineral intake while still taking advantage of the other nutritional qualities of potatoes by boiling them, thinly sliced. This method will remove a large quantity of many minerals, including potassium. It is not necessary to complicate the process by leaching potato slices before boiling them. ScienceDaily (June 2, 2008)

    “Leaching, which refers to soaking food in water before cooking, had little effect on the mineral levels of the samples. Because leaching alone was an ineffective method for reducing potassium content, there exists little benefit for renal failure patients trying to reduce potassium consumption by leaching potatoes.” (E!Science News)
    This opinion is repeated by the Institute of Food Technologists:
    “Because leaching alone was an ineffective method for reducing potassium content, there exists little benefit for renal failure patients trying to reduce potassium consumption by leaching potatoes.

    Certain Potato Preparation Guidelines for Kidney Dialysis Patients Ineffective
    Boiling Small Potato Pieces, Not Leaching, Resulted in Larger Loss of Nutrients. Institute of Food Technologists

    “…the practice of leaching did not remove any significant amount of potassium.”
    “So, if you wish to eat potatoes, boil them or go to nightly nocturnal hemodialysis. However, you should no longer depend on leaching as a method of removing what can be deadly levels of potassium.” Peter Laird, MD

  5. #5
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    Exclamation Re: Leaching Potatoes

    Quote Originally Posted by turminator View Post
    Leaching, which refers to soaking food before cooking, had little effect on the levels of minerals in the samples. Some guidelines for the preparation of potatoes, for dialysis patients ineffective. white potato is a valuable source of potassium in the human diet.
    Reported spammer just copy pasting other's posts to sound on topic. Do not click his signature link!
    Angie
    Kidney KornerDialysis Ethics Forum Kidney PixAwareness Shirts KidneySpace Donor Search
    I will be walking a Kidney Walk in Ontario Canada Sept 18th 2011

    • Peritoneal Dialysis = 4 yrs
    • Hemo Dialysis (in center) = 2 yrs
    • 2 kidney transplants = 1990 - 2001 & 2007 to present

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