

Lettuce is a leafy vegetable, famous for giving salads their base. There are multiple types of lettuce, and they all share the
scientific name Lactuca sativa.
The health benefits of lettuce come primarily from its vitamin content. Health benefits vary depending on the type of lettuce a person eats. All lettuces fall into one of four varieties:
* Head lettuce (capitata)
* Leaf lettuce (crispa)
* Romaine lettuce (longifolia)
* Celtuce lettuce (augustana)
Head lettuce gets its name from its round shape. This variety includes iceberg and butterhead lettuces, both of which are commonly sold in grocery stores.
Leaf lettuces don't form a head, and are instead connected to a stem. Some of these lettuces are darker in color or have reddish
leaves.
Romaine lettuce is another lettuce type commonly sold in grocery stores. It's also known as the main ingredient in Caesar salad.Celtuce lettuce, also called asparagus lettuce or stem lettuce, has a distinctive, large stem. This lettuce variety is common in China, but less common in the Western world.



Lettuce is a source of vitamin A, which plays a role in eye health. Vitamin A can reduce a person's risk of cataracts. Vitamin A also helps prevent macular degeneration.
Improved Sleep
Extracts of multiple lettuce types have also been shown to promote sleep. Until further research is conducted, it's unknown if lettuce in its natural form can produce a similar effect.
Nutrition
The nutritional content of lettuce varies across varieties. Almost all lettuces contain a significant amount of vitamin A, along with small amounts of vitamin C and iron.
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