Arnold warns that raw kale and spinach are high in oxalic acid, which can cause kidney stones, gout, and vulvodynia. He argues these greens suppress appetite and damage the gut, despite their superfood reputation.
Kale and spinach, especially raw, which are full of another plant toxin called oxalic acid that is causing kidney stones, gout, and even something called vulvodynia, which is when razor sharp crystals of calcium oxalate form in the vulva, which is really painful for women and they don't know it. And then they eat another kale salad, chase it with a kale smoothie. Kale is not a superfood. It actually has things that keep you from wanting to eat it, and it shreds your gut.
