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Fiber is both diet fad and fixture for good health – a doctor explains why there is no one-size-fits-all way to increase your intake

<name>Jean Liew, Assistant Professor of Medicine, Boston University</name> <foaf:homepage rdf:resource="https://theconversation.com/profiles/jean-liew-2699124"/>· 23 septembre 2026

Many whole foods, such as fruits, vegetables, legumes and nuts, are high in fiber. bit245/iStock via Getty Images Plus The numbers are clear: Americans aren’t getting enough fiber . Research has consistently shown that high-fiber diets are linked to significant health benefits

Résumé

1

Americans lack fiber

Most Americans do not consume enough dietary fiber, which is essential for health.

The recommended daily intake is 25 grams for women and 38 grams for men, but from 2013 to 2018, only 4% of U.S.

adults met these targets.

On average, Americans consume about 16 grams of fiber per day.

This shortfall is called the fiber gap.

Fiber is found in plant-based foods like whole grains, fruits, vegetables, legumes, nuts, and seeds.

It is a type of carbohydrate that the body cannot digest, yet it plays a critical role in maintaining digestive health, regulating blood sugar, and supporting heart health.

Despite its benefits, fiber is often overlooked in favor of other nutrients, leading to widespread deficiency in the American diet.

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