https://collegedunia.com/exams/oxalate-chemistry-articleid-2582
Excess intake of foods containing high amounts of Oxalic acid can show adverse effects on Health. Oxalic acid present in the food combines with divalent metallic cations such as iron (II) and calcium and form crystals of the corresponding Oxalates. These crystals are then excreted from urine as minute crystals.
These Oxalates may result in the formation of larger kidney stones which can obstruct the kidney tubules. Approximately 80% of kidney stones are formed due to calcium Oxalate. Foods that contain high amounts of Oxalates should not be consumed raw. They should be boiled or soaked in water before consumption. Mostly sufficient intake of water everyday can drive out Oxalates out of the body and reduce the risk of kidney stones.
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