Purslane, good king henry, new zealand spinach, cranberry hibiscus, rhubarb, taro, sorrell, oca..
Lots of plants in a permaculture garden are high in oxalic acid, and the internet has lots of claims that it can cause kidney stones or prevent your body from absorbing minerals. I have a diet high in these foods, (although I blanch them as much as possible) and have no negative health effects and normal iron levels. Just wondering if anyone has thoughts on this topic?