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Stacy Wiegman, PharmD, Pharmacy, answeredDietary fiber refers to those fibers found in natural substances in our diets. Fiber supplements vary. They can be made from natural or synthetic fiber sources. Health care professionals generally prefer that people get their daily fiber intake from their diet via plant-based foods like legumes, whole grains, fruits, and vegetables. However, many people find it challenging to get the recommended intake of 25 to 30 grams of fiber per day from their diet. In fact, the average person gets only 10 to 15 grams of fiber per day. Fiber supplements can be used to make up the difference.