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Dietary Fiber
Reviewed by Medicinsk Expert•Last updated: 2026-10-22•Food Nutrition

Dietary Fiber

Dietary fiber is a plant-based carbohydrate that aids in digestion, weight control, and overall health.

Overview

Fiber is a substance in plants. Dietary fiber is the kind you eat. It's a type of carbohydrate. You may also see it listed on a food label as soluble fiber or insoluble fiber. Both types have important health benefits.

Sources

Good sources of dietary fiber include:

  • Whole grains
  • Nuts and seeds
  • Fruit and vegetables

Health Benefits and Precautions

Dietary fiber adds bulk to your diet and makes you feel full faster, helping you control your weight. It helps digestion and helps prevent constipation. Most Americans don't eat enough dietary fiber. But add it to your diet slowly. Increasing dietary fiber too quickly can lead to gas, bloating, and cramps.

Frequently Asked Questions

The general recommendation is 25 grams for women and 38 grams for men, but most people aim for 25–30 grams. Spread fiber throughout the day by adding a piece of fruit, a handful of nuts, or a serving of whole grains to each meal.
Yes. Fiber adds bulk, slows gastric emptying, and promotes satiety, which can reduce overall calorie intake and support weight management.
Common symptoms include gas, bloating, and cramping. If you experience these, reduce fiber intake gradually, increase water consumption, and spread fiber sources across meals to give your digestive system time to adjust.===
Certain fibers can bind to medications and reduce absorption. If you’re on prescription drugs, discuss timing and dosage with your pharmacist or doctor, and consider taking medications at least 1–2 hours before or after high‑fiber foods.
Source: MedlinePlus, National Library of Medicine

MedlinePlus brings together authoritative health information from the National Library of Medicine (NLM), the National Institutes of Health (NIH), and other government agencies and health-related organizations.

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