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Nuts are an extremely nutritious food if properly prepared. Traditional people always soaked or partially sprouted their seeds and nuts before they were eaten. This is because nuts contain numerous enzyme inhibitors, such as phytic acid, that can put a real strain on the digestive mechanism if consumed in excess. Nuts are easier to digest and their nutrients are more readily available if they are first soaked overnight in water and then dried. This method imitates the Aztec practice of soaking pumpkin and squash seeds and drying them in the sun before eating whole or grinding them into a meal. Soaking the nuts and seeds in water neutralizes the enzyme inhibitors and can increase the vitamin and mineral content.
http://www.localforage.com/local_forage/2007/05/enzyme_inhibito.htmlphytic acid and various enzyme inhibitor which are naturally found in all grains, nuts and seeds. Phytic acid combines with iron, calcium, magnesium, copper and zinc in the intestinal tract and thus interferes with the absorption of these substances. Enzyme inhibitors can interfere with digestion. Heat does not neutralize phytic acid or enzyme inhibitors. For this reason, all grains, nuts and seeds should either be sprouted, soaked in an acidic medium (such as lemon juice or whey), fermented or sour-leavened in order to make them more digestible and nourishing. (Many people who are allergic to grains can tolerate them when they are prepared in this way.)
http://www.westonaprice.org/letters/index.htmlPhytic acid is found within the hulls of nuts, seeds, and grains.[1] In-home food preparation techniques can reduce the phytic acid in all of these foods. Simply cooking the food will reduce the phytic acid to some degree. More effective methods are soaking in an acid medium, lactic acid fermentation, and sprouting.[4]
Phytic acid is a strong chelator of important minerals such as calcium, magnesium, iron, and zinc, and can therefore contribute to mineral deficiencies in people whose diets rely on these foods for their mineral intake, such as those in developing countries
http://en.wikipedia.org/wiki/Phytic_acid