Because it's so rich in water, lettuce is very low in calories, containing fewer than 10 calories per cup. Lettuce, like romaine, is a rich source of vitamins A, K, and folate. It also provides ...

Smoothies: Some types of lettuce, like romaine, can be blended into smoothies for added nutrients. Types of Lettuce Iceberg Lettuce: Known for its crisp texture and mild flavor, it's a popular ...