Has the highest Nutrient Rating of all vegetables! An excellent source of iron that rivals meat sources and is virtually fat-free. Iron is key for your body's energy production and metabolism. Spinach is also rich in phytonutrients, both carotenoid and flavonoid, which act as antioxidants. Carotenoid phytonutrients protect against cell damage, while flavonoid phytonutrients (spinach contains at least 13 different kinds) act as anticancer agents in the body.