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Chocolate is a source of oxalate which, along with calcium, is one of the main components of kidney stones.

The results yield a surprise: "We found that part of the cadmium is stored in calcium oxalate crystals in roots and branches of the cacao plant, which was unexpected," explains Blommaert.

Kidney stones are most commonly formed from calcium oxalate, which is a waste product produced by the body.

The method takes advantage of arid-adapted plants that produce oxalates -- ions containing carbon and oxygen that might ring a bell if you're unlucky enough to suffer from kidney stones or gout.

Chewing a portion of its stem can render someone temporarily but painfully speechless, as the calcium oxalate crystals in it can cause throat and mouth swelling.