This recipe comes from Williams-Sonoma Essentials of Healthful Cooking. According to the intro they gave to the recipe "Spinach is one of the most nutritious vegetables." It went on to say that when it was cooked its nutrients become even more concentrated. It is high in iron, potassium and vitamins A and C; the leaves are rich in leutine and zeaxathin, phytochemicals that protect vision. Besides being healthy it is delicious!