Robert Rodale, years ago, published a bulls eye type illustration -- best, at the center, was sweet potatoes.

Candy Corn of course!

As a general rule, the more deeply/vividly colored the vegetable, the more nutritious it is . (For example, spinach is more nutritious than iceberg lettuce.)

They're all nutritious in their own ways, so it's best to eat a variety! Check out some of our favorite vegetable recipes here: http://www.food52.com/recipes/search?cat=vegetables,top_recipes