Many people are afraid of eating too many greens because they have heard the possible dangers of eating too much oxalic acid. Greens, like certain plant foods are high in oxalic acid. You might already guess my stance on this controversy but just
"In Defense of Oxalic Acid". An article describing its benefits and risks relating to the formation of kidney stones and the absorbtion of calcium. Includes a food chart with oxalic acid levels. A common source is rhubarb. A very good read!
Oxalic acid in spinach - I'm not good with raw spinach and kale. Cooked definitely works best for me.
If you have a history of calcium oxalate kidney stones or kidney disease, you may need to limit oxalate consumption. Plants naturally contain oxalic acid, so if you eat a balanced diet that includes fruits, vegetables, beans and nuts, you also consume oxalic acid, or oxalate. For most people, this isn’t a problem because it's eliminated...