Iceberg lettuce is the crunchy, pale vegetable youll often find added to your fast-food burger or diner salad when you eat out. It has a neutral taste and refreshing crunch, making it a favorite among children. Iceberg lettuce provides significant amounts of vitamins A and K. It also has small amounts of many other healthy nutrients. Although its low in fiber, it has a high water content, making it a refreshing choice during hot weather. It also provides calcium, potassium, vitamin C, and folate.