Parsley was revered for is medicinal potency long before it was eaten as a food. Native to the central Mediterranean region, the herb was sacred to the ancient Greeks. They used it to adorn victorious athletes and decorate the tombs of the dead.
Spinach is heating in the digestive tract and drying. It is unusual because very few foods are both astringent and hot. It contains oxalic acid which provokes Pitta and is especially contraindicated for kidney stones. Cooking destroys the oxalic acid.