oxalic acid
Also known as: Oxalates

What is it?

A chemical or chemical compound, usually taken as food, that not only nourishes the body but also is essential to life. Oxalic acid exists naturally in some foods — beet greens, chard, rhubarb and spinach, to name four — and binds with CALCIUM in the body, forming useless calcium oxalate. For all the calcium in spinach, it's estimated that only 5 percent is absorbed by the body; the lion's share combines with oxalic acid, forming the insoluble oxalate. Cocoa contains oxalates, too, but not enough to block the absorption of the calcium in hot chocolate or chocolate milk
 
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