Some scientists or shall we say experts on ancient diets estimate that prehistoric man ate as much as 100 to 200 g of fiber a day... Which could make sense because the vegetables we eat these days have been so domesticated that their starch content is far higher than it was in the past.. people ate a lot of different plant items from undomesticated plants, these plant parts were not high starts they were like low starts but they had some starch and some protein and some fat... But the fiber part of it was much greater because it was hard to separate the fiber from the starch.. so it's quite possible that these prehistoric people say 20,000 years ago 30,000 years ago whatever ate well over 100 g of fiber a day..

The fiber requirement today is supposed to be 23 g of fiber, maybe 24.. the average American eats maybe 20 grams of fiber a day..