What is the recommended daily intake of fiber for adults?

35 grams According to the American Heart Association, the average American takes in 15 grams of fiber. Several organizations recommend 25 - 30 grams a day. The American Dietetic association recommends 25 - 35 grams a day. If your intake is 15 grams or less and you want to increase your fiber intake, increase it gradually. If you jump from 15 to 35 grams a day, it may cause stomach cramping and gas.