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Dietary fiber is defined to be plant components that are not broken down by human digestive enzymes. [1] In the late 20th century, only lignin and some polysaccharides were known to satisfy this definition, but in the early 21st century, resistant starch and oligosaccharides were included as dietary fiber components.
Research published in 2019 suggests that most adults need about 1.3-1.8 grams per kilogram of body weight, which means that the government recommendations are too low.
ShutterstockNot to sound alarmist, but we have a fiber crisis on our hands. A 2021 study found that only seven percent of U.S. adults are getting enough fiber—a critical nutrient required for ...
Most adults in the U.S. aren't eating enough fiber. Start with high-fiber vegetables to get more in your diet. Learn why experts love these fiber-rich veggies.
A third class of dietary material, fiber (i.e., nondigestible material such as cellulose), seems also to be required, for both mechanical and biochemical reasons, though the exact reasons remain unclear. For all age groups, males on average need to consume higher amounts of macronutrients than females.
Fibre supplements (also spelled fiber supplements) are considered to be a form of a subgroup of functional dietary fibre, and in the United States are defined by the Institute of Medicine (IOM). According to the IOM, functional fibre "consists of isolated, non-digestible carbohydrates that have beneficial physiological effects in humans".