Here's which types of lettuce are most popular, why these greens are good for you and what you need to be mindful of as you include more in your diet.

Crisphead, or iceberg, is probably the best-known ... Commonly available in red and green varieties, loose-leaf lettuce is a bit more perishable than head-type lettuces and should be dressed ...

8 large iceberg or romaine lettuce leaves 2 cups grated Monterey Jack, mozzarella, or cheddar cheese 1 1/2 cups very finely sliced red onion, rinsed and drained About 1 1/2 cups loosely packed fresh ...