National Geographic : 1977 Jan
Bran may be the richest source of food fiber in the American diet. _ _- Foodflber'simportanceto our nutrition is rapidly gaining recognition.But we've knownfor years that Kelloggsfiber-rich cereals help the digestive system regulate itself. Sources offiber. Generally speaking,food fiber is found in fruits, vegetables, and whole grains. But many Americans don't eat thesefoods in quantity e there are ericanfoods fiber there arefew roI Bran, the outer layerof the wheat kernel. is one of nature's richest sources of fiber.