Popeye was definitely on to something. Spinach is a super food loaded with tons of nutrients in a low calorie package. Dark leafy greens like spinach are important for skin and hair, bone health, and provide protein, iron, vitamins and minerals. Spinach is low in fat and even lower in cholesterol, spinach is high in niacin and zinc, as well as protein, fiber, vitamins A, C, E and K, thiamin, vitamin B6, folate, calcium, iron, magnesium, phosphorus,...