Generally eating lettuce is not bad, on the contrary, usually eat lettuce in moderation can add certain nutrients for the body. Every 100g of lettuce contains 95.8g of water, 1.3g of protein, 2.0g of carbohydrates, 0.6g of ash, as well as 1790.0mg of carotenoids, 0.40mg of niacin, 0.03mg of thiamin, 13.0mg of vitamin C, 34mg of calcium, 170mg of potassium, 1.20μg of selenium and other nutrients. Usually eating lettuce is not bad for the body, usually eat lettuce in moderation can supplement the above nutrients for the body. Although eating lettuce is not bad for the body, but before eating lettuce need to lettuce clean, to ensure that the food is fresh and safe. In addition, it is important not to eat too much lettuce at one time.