Leaf lettuce is rich in inorganic salts and vitamins, and each 100 grams contains 1.3 grams of protein, 0.1 grams of fat, 2.1 grams of carbohydrates, 40 milligrams of calcium, 1.2 milligrams of iron, 1.42 milligrams of carotenoids, 0.06 milligrams of aminomethodamine, 0.98 milligrams of riboflavin, 0.4 milligrams of nicotinic acid, 10 milligrams of ascorbic acid. Calcium, carotene and ascorbic acid content of stem lettuce is less than that of leaf lettuce, with about 7.0 mg, 0.02 mg and 1.0 mg per 100 grams in that order. Lettuce also contains mannitol, lactic acid, malic acid, glauconic acid, lipids and so on.
Lettuce smells bitter, cold, its medicinal functions are: benefit the five viscera, through the meridians, open the chest and intestines, gas, firming the tendons and bones, clearing heat, diuretic, lactation and other effects. It can be used for the treatment of urinary red heat and shortness, blood in the urine, lactation and so on.
The nutritional value of lettuce leaves is very high, can not be thrown away, it can be deep-fried water and add seasoning condiments cold and eat, or pickled and dried mixed with sesame oil steamed, or put onions, ginger, garlic, dry chili stir-fried to eat, no matter how to cook, should be light for the expensive.