'I recently came across data around the lack of fiber in the American diet. The daily requirements for fiber range from 25 – 30 grams per day for an adult, but the average American is getting half of that.
While I doubt there is a concerted effort to avoid the nutrient, the standard American diet of highly refined foods simply does not provide enough fiber to support optimal health.
How so? A single apple has 4 grams of fiber but an 8 ounce glass of juice made from 3-4 apples only has 0.5 grams of fiber. Refined white flour has 1/3 the fiber of whole wheat flour. Much of the fiber available in vegetables, fruits, and whole grains is lost during the refining process.'