phytic acid

(Part II) Whole grain toxicity - Phytic acid causes mineral deficiencies (Opinion)

Saturday, November 06, 2010 by: Rami Nagel
Tags: whole grains, phytic acid, health news

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(NaturalNews) In the last installment of this whole grain article series, we looked at phytic acid and its potentially negative health effects. Phytic acid is an indigestible form of the mineral phosphorous, which we need. High-phytate diets result in mineral deficiencies. In populations where cereal grains provide a major source of calories, rickets and osteoporosis are common. (Footnote 1)

Interestingly, the body has some ability to adapt to the effects of phytates in the diet. Several studies show that subjects given high levels of whole wheat at first excrete more calcium than they take in, but after several weeks on this diet, they reach a balance and do not excrete excess calcium.(F 2) However, no studies of this phenomenon have been carried out over a long period; nor have researchers looked at whether human beings can adjust to the phytate-reducing effects of other important minerals, such as iron, magnesium and zinc.

The zinc- and iron-blocking effects of phytic acid can be just as serious as the calcium-blocking effects. For example, one study showed that a wheat roll containing 2 mg phytic acid inhibited zinc absorption by 18 percent; 25 mg phytic acid in the roll inhibited zinc absorption by 64 percent; and 250 mg inhibited zinc absorption by 82 percent.(F 3) Nuts have a marked inhibitory action on the absorption of iron due to their phytic acid content.(F 4) Not all foods high in phytic acid block iron absorption, like coconut. This is a sign that there are other factors at play when looking at the toxicity of grains.

Over the long term, when the diet lacks minerals or contains high levels of phytates or both, the metabolism goes down, and the body goes into mineral-starvation mode. The body then sets itself up to use as little of these minerals as possible. Adults may get by for decades on a high-phytate diet, but growing children run into severe problems. In a phytate-rich diet, their bodies will suffer from the lack of calcium and phosphorus with poor bone growth, short stature, rickets, narrow jaws and tooth decay, and for the lack of zinc and iron anemia and mental retardation may result.

The figures for the amounts of phytic acid can vary somewhat because of different levels of moisture in the test food, as well as because different varieties of the same plant can yield different results.

More Phytic Acid Figures. Milligrams per 100 grams / 3.5 ounces of food. (F 5)
Sesame seeds dehulled 5,360
Pinto beans 600 - 2,380
Navy beans 740 - 1,780
Parboiled brown rice 1,600
Barley 1,190
Coconut meal (similar to coconut flour) 1,170
Whole corn 1,050
Rye 1,010
Wheat flour 960

In the next installment of Whole Grain Toxicity, we'll look at the surprising connection between vitamin D and grain consumption. You will also begin to learn how to block the negative effects of phytic acid in your diet.

References / Footnotes
1. Wills MR and others. Phytic Acid and Nutritional Rickets in
Immigrants. The Lancet, April 8, 1972, 771-773.
2. Walker ARP and others. The Effect of Bread Rich in Phytate
Phosphorus on the metabolism of Certain Mineral Salts with
Special Reference to Calcium. The Biochemical Journal 1948
42(1):452-461.
3. Iron absorption in man: ascorbic acid and dose-depended
inhibition. American Journal of Clinical Nutrition. Jan 1989
49(1):140-144
4. Inhibitory effect of nuts on iron absorption. American Journal
of Clinical Nutrition 1988 47:270-4.
5. Reddy NR and others. Food Phytates, CRC Press, 2001.


About the author

Ramiel Nagel is the internationally published author of Cure Tooth Decay and Healing Our Children In "Cure Tooth Decay" Nagel, reveals how your teeth can heal naturally because they were never designed to decay in the first place! Now there is a natural way to take control of your dental health by changing the food that you eat. Receive 19 free lessons on how to stop cavities
"Healing Our Children" explains the true causes of disease conditions of pregnancy and childhood so that you can avoid and prevent them. It provides essential natural health programs so that mothers and their new babies can optimize their health during the times of preconception, pregnancy, lactation and early childhood. Receive a free chapter of Healing Our Children
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