What vegetables are the leaves in the hamburgers of KFC and McDonald's?

Lettuce is an annual or biennial herb with long obovate leaves and dense cabbage-like bulbs. Can be eaten raw, crisp and refreshing, slightly sweet. Lettuce is native to the Mediterranean coast of Europe and domesticated from wild varieties. The ancient Greeks and Romans ate it first.

Lettuce has been introduced into China for a long time, and it is widely planted in the southeast coast, especially in the suburbs of big cities and Guangdong and Guangxi. In recent years, the planting area has expanded rapidly, and lettuce has also entered the dining table of ordinary people from hotels and restaurants.

Extended data:

Lettuce is sweet and cool. Because its stems and leaves contain lettuce, it tastes slightly bitter. It has the effects of clearing away heat, refreshing, relieving pain, hypnotizing, lowering cholesterol, and adjuvant treatment of neurasthenia. Lettuce contains mannitol and other effective ingredients, which has the effects of diuresis and blood circulation, liver-clearing and gallbladder-benefiting.

Lettuce contains a substance called protocatechuic acid, which has obvious inhibitory effect on cancer cells, especially in resisting digestive system cancers such as gastric cancer, liver cancer and colorectal cancer.

The content of dietary fiber and other nutrients in lettuce is high. Eating regularly can eliminate excess fat, and lettuce can lose weight.

Lettuce is rich in nutrients, including a large number of β-carotene, antioxidants, vitamin B 1, B6, vitamin E, vitamin C, a large number of dietary fiber, magnesium, phosphorus, calcium and other trace elements and a small amount of iron, copper and zinc. Strengthen the digestion and absorption of protein and fat, improve the blood circulation of the stomach, and eat lettuce often.

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