OXALIC ACID / CALCIUM....PROBLEMS

Oxalic acid is a strong acid, and is irritating to tissue all by itself. Extremely high doses are fatal. Oxalates, on the other hand, form tiny little insoluble crystals with sharp edges, which are also irritating to tissue. So, high levels of oxalic acid/oxalates in the diet lead to irritation of the digestive system, and particularly of the stomach and kidneys. They may also contribute to the formation of kidney stones (the most common form of kidney stone is composed of calcium oxalate).

Foods containing these chemicals may be consumed in moderation. However, if you suffer from kidney disease, kidney stones, Rheumatoid Arthritis , or gout, it is usually recommended that you avoid foods that are high in oxalates or oxalic acid. Foods generally found on the list include: chocolate, cocoa, coffee, most berries (especially strawberries and cranberries), most nuts (especially peanuts), beans, beets, bell peppers, black pepper, parsley, rhubarb, spinach, swiss chard, summer squash, sweet potatoes, and tea.

Plant foods with high concentrations of oxalic acid (over 200 ppm) include (but are not limited to): lamb's-quarter, buckwheat, star fruit, black pepper, purslane, poppy seeds, rhubarb, tea, spinach, plantains, cocoa and chocolate, ginger, almonds, cashews, garden sorrel, mustard greens, bell peppers, sweet potatoes, soybeans, tomatillos, beets and beet greens, oats, pumpkin, cabbage, green beans, mango, eggplant, tomatoes, lentils, and parsnips.

Info for the preceding paragraph comes from the ARS Phytochemical Database

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