The King of Vegetables-Spinach Few vegetables have been praised and questioned as much as spinach. Known as the "king of vegetables", but also described as "highly toxic"; In cartoons, it makes Popeye strong, but it is also the most disgusting food for many children. Spinach is called "the king of vegetables" because of its high nutritional value. It contains a lot of beta carotene (a cup of raw spinach is 70% of the daily recommended amount) and is also an excellent source of folic acid, iron, potassium and magnesium. The so-called "most toxic" means that oxalic acid in spinach meets calcium and forms calcium oxalate. It is widely rumored on the Internet that "calcium oxalate deposited in the brain will damage the brain, and deposited in the kidney will damage the kidney, and the damage is systemic". In fact, spinach does have oxalic acid, but only when the intake is large and the concentration of oxalic acid and calcium in the body is high can it be combined; What's more, in the process of cooking, oxalic acid will also be destroyed, so the amount eaten into the body is more limited.