Spinach

Popeye was right: Spinach is an excellent source of iron. This leafy green vegetable is also rich in foliate (folic acid), which helps protect against heart disease, certain cancers, and cognitive impairment in the elderly. Spinach is good for your eyes: It's loaded with lutein and zeaxanthin, two carotenoid compounds known to reduce the risk of cataracts and age-related macular degeneration. And it's high in calcium and vitamin K, both of which are important for bone health.
To use: Dress fresh spinach with lemon juice and olive oil and enjoy as a salad. Sauté spinach in olive oil, garlic, and red pepper. Add layers of steamed spinach to lasagna. Or try a Greek spinach and feta pie (spanikopita).