The daily value for fiber is 25 grams per day on a 2,000-calorie diet for adults. This number may also depend on age or sex: women under 50: 21 to 25 grams per day. men under 50: 30 to 38 grams per day.
The 2015-2020 Dietary Guidelines for American recommends that the acceptable limits for fiber intake is 14 gram fiber per 1,000 kcal. Thus if one eats about 2000 calories of food everyday, it is expected that he or she should consume about 28 grams of fibre.
