Which statement best describes the roles of dietary fiber in digestion and the differences between soluble and insoluble fibers?

• A. Fiber promotes regularity and satiety; soluble fiber slows digestion and can lower cholesterol; insoluble fiber adds bulk and speeds intestinal transit.
• B. Fiber provides calories; soluble fiber speeds digestion; insoluble fiber reduces mineral absorption.
• C. Fiber is digested into glucose; soluble fiber increases cholesterol; insoluble fiber has no effect.
• D. Fiber is only found in animal products; soluble fiber is insoluble; both have identical effects.

Answer: (A)