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Fiber

By

Adrienne Youdim

, MD, David Geffen School of Medicine at UCLA

Last full review/revision Aug 2019| Content last modified Aug 2019
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Some foods contain fiber, which is a tough complex carbohydrate. Fiber may be

  • Partly soluble: It dissolves in water, and the body may be able to digest some of it.

  • Insoluble: It does not dissolve in water, and the body cannot digest it.

Eating too much insoluble fiber can interfere with absorption of certain vitamins and minerals.

Authorities generally recommend that about 30 grams of fiber be consumed daily. In the United States, the average amount of fiber consumed daily is about 12 grams because people tend to eat products made with highly refined wheat flour and do not eat many fruits and vegetables. An average serving of fruit, a vegetable, or cereal contains 2 to 4 grams of fiber. Meat and dairy foods do not contain fiber.

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Test your knowledge

Thiamin
Thiamin, vitamin B1, is widely available in common foods. This vitamin is essential for metabolism of carbohydrates, proteins, and fats, as well as for normal nerve and heart function. Which of the following is NOT a potential cause of thiamin deficiency?
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