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.

The shape of an arugula leaf is similar to oakleaf lettuce, with rounded edges that undulate from broad to slight. Baby arugula, which is typically shorter than an index finger, is more widely ...

and while slept-on oakleaf lettuce is pretty and colorful, it's just too delicate. Instead, consider something with a big, flat leaf, such as iceberg, butter lettuce, red or green leaf lettuce ...