Should ideal dietary fibre quantities relate to the amount of food one consumes?
Typically advice seems (for the non-medical professional) to state recommended dietary fibre in absolute mass.
I wonder if it is more accurate to state recommended dietary fibre in terms of the quantity of food being eaten? Perhaps as a percentage of the mass?
The reasoning behind this is simply that dietary fibre seems less to do with obtaining nutrients, but more to do with the physical consistency of food / bolus / chyme.
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Recommendations for dietary fiber intake are usually based on age/calorie intake:
The Dietary Guidelines for Americans 2015-2020 (p.97) recommendation for men age 19-30 (2,400 - 3,000 Cal range) is 33.6 g and for girls age 4-8 (1,200 Cal) is 16.8 g of fiber per day.
According to Food and Drug Administration, the "daily value" for dietary fiber in a 2,000 Cal diet is 25 g.
It may be more important to think about the soluble/insoluble fiber ratio: Most metabolic health effects suggested so far are associated with soluble fiber and bowel regularity with insoluble fiber.
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