(HealthDay News) -- Fiber is a plant substance that's required eating for a healthy diet. Lots of fiber is needed each day to help reduce the risk of heart disease, improve digestion, prevent constipation and maintain a healthy body weight, the U.S. National Library of Medicine says.
Fiber can be found in fruits, whole grains and vegetables. Most adults should eat at least 20 grams to 35 grams of fiber every day, though the agency says most people only eat about half as much.
It's best to slowly increase the fiber in your diet instead of piling it on all at once. A sudden increase in fiber intake can cause abdominal discomfort, the NLM says.