There are roughly 6 grams of carbohydrates in 1 cup of shredded lettuce. There are also 7 calories and 1/2 gram of fiber included in this serving size.
Lettuce is often considered a "free" food for those following low-carbohydrate diets because lettuce does not significantly affect the body's glucose levels. One large lettuce leaf contains a scant 3 grams of carbohydrates. Lettuce is considered a strong source of fiber, vitamin K and vitamin A. Vitamin C, iron, folate, potassium and thiamin are also abundantly present in lettuce. Lettuce is often enjoyed on sandwiches or wraps, or as the main ingredient in low-carbohydrate salads.