Is Spinach More Nutritious Raw or Cooked?
It Depends. Boiling vegetables causes a significant amount of nutrients that dissolve in water – vitamin C, folate and thiamin (vitamin B1) – to be leached away. Steaming is much gentler on nutrients because vegetables don’t come in contact with cooking water. Dry cooking methods like grilling, roasting, stir-frying and microwave cooking without water also preserve a greater amount of nutrients than boiling or pressure cooking. Green vegetables such as spinach, beet greens and Swiss chard are high in calcium, but their high levels of a compound called oxalic acid binds calcium and reduce its absorption. Cooking releases some of the calcium that’s bound to oxalic acid. Three cups of raw spinach, for example, have 90 milligrams of calcium, whereas one cup of cooked has nearly triple the amount (259 milligrams). Cooking vegetables also increases the amount of magnesium and iron that’s available to the body.
Note: Raw spinach is still a powerhouse veggie.