A Grade, High Quality, Color - Light Green to Dark Green. One cup of iceberg lettuce contains: 10 calories, 0 grams of fat, 1 gram protein, 2 grams carbs (1 of dietary fiber), 7 percent of vitamin A, 3 percent of vitamin C, 1 percent of calcium and 2 percent of iron. It also contains trace amounts of potassium, folate, vitamin K, magnesium and phosphorus.
