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David Watson's avatar

Most plant foods have some, in varying amounts. Spinach is one of the highest, and I was eating a lot of it. Search on oxalate food and you'll find lists showing amounts.

Formally, it's oxalic acid. Oxalate is a general term for the combinations with other molecules, like magnesium and calcium. We can handle some amount, excreting it through the urine. If we consume more than the kidneys can process, especially if not drinking enough water, it gets stored as tiny sharp crystals called raphides that accumulate in kidneys (as stones), urinary tract, joints, heart, others. Docs like to prescribe meds or procedures to break them up, but it seems better just to remove the source. Not much profit in just telling us to lighten up on the spinach.

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