Lettuce provides many health benefits. It contains nutrients like iron, beta carotene, fiber, vitamins A, C, E, and B vitamins. Eating lettuce can help reduce nervousness, blood sugar levels in diabetics, influenza symptoms, and aid in sleep and digestion. It also helps fight tooth decay, cancer, and prevents anemia during pregnancy. While head lettuce is more gas-forming, leaf lettuce is richer in iron. Lettuce latex can also be used as a sedative or sleep inducer.