Spinach With its low calories and high nutrients, spinach should definitely become a part of your diet. As pointed out in our March 2012 issue, within the Scope This article "Top 10 Superfoods That Provide Iron," this nutritious green is considered a nutrition superstar. Research supports this claim by showing that spinach aids in the prevention of age-related macular degeneration, cataracts, some cancers and cardiovascular…