Oxalic acid is a very harmful substance to human health, and yet many of the vegetables that are currently championed as superfoods, including chard, spinach and sweet potatoes, contain dangerously high levels. The harm this substance causes has been known about in the medical literature for 200 years, and yet oxalates … [Read more...] about Ep 170 Toxic Superfoods — The hidden dangers of Oxalates, with Sally K Norton