As a food, lettuce does not have the effect of medicine, the benefit is that after consumption can play a role in replenishing the body with carbohydrates and other nutrients. Every 100 grams of lettuce about 62% of the part is edible part, containing 1 gram of protein, 2.8 grams of carbohydrates, 0.1 grams of fat and other substances, after consumption can be for the body to supplement a certain amount of energy. In addition, every 100 grams of lettuce is rich in vitamins and minerals and other nutrients, including carotene, vitamin C, potassium, sodium, phosphorus, calcium and other components of a relatively high, after consuming a certain benefit to the body, does not have the efficacy of drugs. However, daily attention should be paid to moderate consumption, to avoid excessive intake, resulting in indigestion and other symptoms.