Spinach and kale may sometimes be pitted against each other in a friendly rivalry in the realm of healthy eating. But is one of these greens a winner over the other? "Spinach and kale are both healthy ...

Kale has become the poster child for a kind of tongue-in-cheek mockery of virtuous eating habits over the past decade, as evidenced by the now ubiquitous “eat more kale” slogan and “keep calm and kale ...