what does  fiber mean
Fiber is a plant-derived carbohydrate that cannot be digested by humans, so it passes through your system relatively intact and has little to no caloric value. There are two types of fiber: Soluble (dissolves in water) and insoluble (does not dissolve in water). Both play an important role in optimal health and occur naturally -- often together -- in foods such as whole grains, fruits, vegetables, nuts, seeds and beans.