Nutrition Basics

Most of iceberg lettuces calories come from its carbohydrate content. Each 2cup serving the serving size that counts as 1 cup of veggies, according to the Harvard School of Public Health provides you with 4 grams of total carbohydrates, including 1.8 grams of dietary fiber. Carbs serve as fuel to keep your nervous system functioning and support muscle contraction, while dietary fiber helps you feel satisfied after your meal and fights constipation.