Fiber is a carbohydrate and is usually listed under “Total Carbohydrates” on the “Nutrition Facts” label. Humans lack the digestive enzymes to breakdown fiber. Therefore, it is undigested and not absorbed into the bloodstream and it arrives at the colon pretty much intact. Fiber has zero calories. Instead of being used for energy, it is excreted from the body.

The current recommended daily intake for adults who are 50 years or younger is 25 grams/day for women and 38 grams/day for men. For adults over 50 years of age, the recommendation is 21 grams/day for women and 30 grams/day for men. Unfortunately, for many who eat a typical American diet, it can be a huge challenge to consume that much fiber everyday. Most people top out at an average of 15 grams/day, regardless of how many calories they eat.

Maybe if we understand more about the different types of fiber …