classic lettuce well known to lovers of Caesar salad. Its understated sweet-bitter flavor, crunchy backbone, and distinctive upright shape have made it America's second most popular lettuce. It's also hardy enough to last a week in your refrigerator. Eaten raw or cooked. It's an essential ingredient in many salads. Can be taken as juice, or even cooked with other vegetables. It has vitamins A and C and K, to lose weight. Excellent source of B1, B2, and C, folic acid, manganese and chromium. Since lettuce is very low in calories and has a high water content, it has been effective when consumed as a diet food. It helps to keep the blood clean. the mind alert and body in good health. There are 2 calories in in one inner leaf of romaine lettuce.