Fiber in Diet: A Complete Digestive Health Guide for Seniors

Food Sources

There are two forms of fiber: soluble and insoluble.

Soluble fiber attracts water and turns to gel during digestion. This slows digestion. Soluble fiber is found in oat bran, barley, nuts, seeds, beans, lentils, peas, and some fruits and vegetables. Research has shown that soluble fiber lowers cholesterol, which may help prevent heart disease.

Insoluble fiber is found in foods such as wheat bran, vegetables, and whole grains. It appears to speed the passage of foods through the stomach and intestines and adds bulk to the stool.

What Are the Possible Risks and Side Effects?

Eating a large amount of fiber in a short period of time can cause intestinal gas (

),

, and

. This problem often goes away once the natural bacteria in the digestive system get used to the increase in fiber. Adding fiber to the diet slowly, instead of all at one time, can help reduce gas or

.

Too much fiber may interfere with the absorption of minerals such as iron, zinc, magnesium, and calcium. In most cases, this is not a cause for too much concern because high-fiber foods tend to be rich in minerals.

What Are Recommendations?

On average, Americans now eat about 16 grams of fiber per day. The recommendation for older children, adolescents, and adults is to eat 21 to 38 grams of fiber each day. Younger children will not be able to eat enough calories to achieve this amount, but it is a good idea to introduce whole grains, fresh fruits, and other high-fiber foods.

To ensure that you get enough fiber, eat a variety of foods, including:

• Cereals
• Dried beans and peas
• Fruits
• Vegetables
• Whole grains

Add fiber gradually over a period of a few weeks to avoid stomach distress. Water helps fiber pass through the digestive system. Drink plenty of fluids (about 8 glasses of water or noncaloric fluid a day).

Taking the peels off fruits and vegetables reduces the amount of fiber you get from the food. Fiber-rich foods offer health benefits when eaten raw or cooked.

Diet – fiber; Roughage; Bulk; Constipation – fiber

What Are Patient Instructions?

• Constipation – what to ask your doctor

• High-fiber foods

• 

  Sources of fiber

Hensrud DD. Diet and nutrition. In: Goldman L, Cooney KA, eds.

. 27th ed. Philadelphia, PA: Elsevier; 2024:chap 13.

US Department of Agriculture and US Department of Health and Human Services. Dietary Guidelines for Americans, 2025-2030. 10th Edition. January 2026.

www.dietaryguidelines.gov/

. Accessed February 19, 2026.

Updated by: Linda J. Vorvick, MD, Clinical Professor, Department of Family Medicine, UW Medicine, School of Medicine, University of Washington, Seattle, WA. Also reviewed by David C. Dugdale, MD, Medical Director, Brenda Conaway, Editorial Director, and the A.D.A.M. Editorial team. Editorial update 11/15/2024.

• Dietary Fiber