Lettuce leaves are not harmful to consume. Lettuce leaves for lettuce branches and leaves part, also called lettuce vegetables. Lettuce leaves are extremely low calorie, every 100 grams of lettuce leaves contain 15 calories, of which 2.9 grams of carbohydrates, 1.0 grams of protein, 0.2 grams of fat. Its calorie and cucumber, tomato about the same, belong to the low calorie food. Lettuce leaves are low in carbohydrates and fat, suitable for patients with diabetes, coronary heart disease, hypertension and other cardiovascular diseases and endocrine diseases, no special contraindications, can add water and all kinds of vitamins and minerals for the body. Lettuce leaves with other foods to eat together, you can take the best of both worlds, can increase water intake, but also can increase the diversity of nutrition and deliciousness.