Greens are types of vegetables that include lettuce, arugula, spinach, cabbage, kale, bok choy and more. They are healthy sources of vitamins and nutrients that protect us from heart disease ...

Next is the perennial, burger-topping iceberg lettuce. You'll need 33 cups of ... Vitamin A is an essential part of normal vision and a health immune system. This pretty red and green leaf is ...

All types of lettuce are healthy. Dark leafy greens—including lettuce, kale and spinach,—are good sources of vitamins A, C, and K, folate, and iron. Lettuce also provides fiber, which helps ...