Asparagus is commonly known as romaine lettuce, and romaine lettuce leaves are edible. Lettuce leaves are the leafy part of lettuce and are completely edible, non-toxic and contain water-soluble vitamins. Lettuce leaves are a very good vegetable with a very low calorie count of about 15 calories per 100 grams. It is very friendly to people who need to control their weight as well as those with high blood cholesterol. It also has a low glycemic index and can be eaten in moderation by diabetics. The vitamin B1 content of romaine lettuce leaves is slightly higher than that of its roots. Eating lettuce leaves in moderation can not only provide the necessary water and vitamins, but also provide a certain sense of satiety and reduce calorie intake.