Lettuce, Chinese cabbage, spinach, rape, leek and amaranth are good sources of carotene, vitamin B2, vitamin C, minerals and dietary fiber.

Green leafy vegetables and orange vegetables are rich in nutrients, especially carotene. Although vitamin B2 is not very rich, it is still the main source of vitamin B2 in China's diet.

Dietary fiber is the "scavenger" of the digestive system, which can promote waste excretion and reduce the absorption of unfavorable substances such as cholesterol.

Vitamin B2 deficiency often leads to cheilitis, glossitis, angular stomatitis, scrotal dermatitis, burning eyes and scleral congestion, which is called "oral reproductive syndrome" and is often accompanied by other vitamins deficiency.

Vitamin C can detoxify and remove carcinogens and reduce nitrite, thus reducing the incidence of malignant tumors such as digestive tract. It also has the functions of promoting antibody formation, enhancing cell phagocytosis and improving immune resistance.

The above argument shows that eating lettuce and other green leafy vegetables is good for your health.