Dietary-Fiber & Health

You’ve probably heard of “eat more fiber”. But have you ever thought why fiber is important for you?

In this article, you will find what is dietary fiber, types & health benefits of dietary fiber, and tips for increasing fiber intake.

What is dietary fiber?

Dietary fiber, also called as roughage, is a portion of plant-derived foods that your body cannot completely digest or absorb. Dietary fibers are grouped in two main categories based on their solubility, viscosity, and ferment ability, which affect how they are processed in your body.

Unlike other food constituents, like carbohydrates, proteins, or fats (which your body can break down, digest, and absorb) — fiber is generally not digestible. Rather, most of it moves intact through your stomach, small intestine, & colon and finally excreted from your body in the form of waste.

Dietary fiber is of two main types: soluble fiber and insoluble fiber, which are parts of plant food products, like legumes, beans, whole grains, cereals, vegetables, fruits, nuts, and seeds.

Soluble fiber: This type of fiber can dissolve in water to form a gel-like substance. It helps reduce blood cholesterol and glucose levels. Soluble fiber is generally contained in oats, barley, beans, peas, carrots, apples, and citrus fruits.

Insoluble fiber: This type of fiber does not dissolve in water. It forms roughage, which facilitates movement of material through your digestive system. It increases stool bulk, so it benefits those who struggle with irregular stools or constipation. Wheat bran, whole-wheat flour, beans, nuts, and vegetables, like cauliflower, green beans and potatoes, are good sources of insoluble fiber.

The amount of insoluble and soluble fiber varies in different plant foods. Try to eat a wide variety of high-fiber foods for getting the greatest health benefit.

Health Benefits of a High-Fiber Diet

A high-fiber diet:

(i) Normalizes bowel movements: Dietary fiber softens your stool and increases its size & weight. A bulky stool is easier to pass, decreasing your chance of constipation. On the other hand, if you have loose, watery stools, fiber can help solidify the stool as it absorbs water and adds bulk to stool.

Tip: The fiber from oat bran & wheat bran is considered more effective than the fiber contained in fruits and vegetables. Increase your fiber intake gradually, and since fiber absorbs water, it’s recommended you also increase your liquid intake as you increase your fiber intake.

(ii) Lowers cholesterol: Soluble fiber has been shown to sop up excess bad cholesterol and ferry it out of your body. This may help reduce the risk of your arteries getting clogged, lower risk of high blood pressure, and heart disease.

(iii) Regulates blood sugar levels: Fiber, especially soluble fiber, can slow down the absorption of sugar. That helps keep the blood sugar level steady, preventing it from rising rapidly. So, a healthy diet that includes insoluble fiber may also lower the risk of developing type 2 diabetes.

(iv) Manages Weight: High-fiber foods are generally more filling than low-fiber foods, which can help keep you fuller longer – preventing overeating.

How much fiber do you need?

According to the Institute of Medicine, the daily fiber recommendations for adults are:

Daily Fiber Recommendations For Adults

Age 50 or lessAge 51 or more
Institute of Medicine
Men38 grams30 grams
Women25 grams21 grams

Best fiber food options

If you aren’t getting enough fiber each day, you may need to increase your intake by including the following foods in your everyday diet:

  • Whole-grain products
  • Fruits
  • Vegetables
  • Beans, peas and other legumes
  • Nuts and seeds

Tip: Refined or processed foods are low in fiber. Some examples are: white breads and pastas, non-whole-grain cereals, canned fruits and vegetables, pulp-free juices. The grain-refining process eliminates the bran (outer coat) from the grain, which reduces its fiber portion. Enriched processed foods may have some of the B vitamins and iron added back, but not the fiber.


(i) Don’t add & start eating a lot of fiber at once. Overdoing it suddenly can cause abdominal bloating, intestinal gas, abdominal cramps, and diarrhea since your system is not ready to process sudden increase in fiber intake. Whereas, these problems are likely to go away over time as your digestive system gets used to the higher fiber intake. But we recommend that you increase fiber intake gradually over few weeks to avoid digestive system problems.

[Read here: Simple Ways To Increase Fiber Intake]

(ii) Make sure to drink plenty of fluids everyday. Increasing the water intake will help move fiber through your digestive system and avert stomach distress.

Tips to help you add more fiber to your daily diet

Try to get fiber from different sources because eating too much of one type of source will not provide you with a balanced diet. The following are some suggestions to increase fiber intake:

(i) Jump-start your day: For breakfast opt for a high-fiber breakfast cereal — five or more grams of fiber per serving. Choose cereals with “bran”, “whole grain,” or “fiber” in the label. Or add a tablespoon of unprocessed wheat bran to your favorite cereal.

(ii) Go for whole grains: Switch to whole grains such as brown rice, wild rice, or bulgur instead of refined grains such as white rice. Choose bread that list whole-wheat flour, whole wheat, or another whole grain as the first ingredient on the label and has at least two grams of dietary fiber per serving. For pasta go for the types made from quinoa or pulses such as chickpeas and lentils.

Note: Use mostly whole-grain flour instead of white flour when baking. Consider adding unprocessed wheat bran, crushed bran cereal, or uncooked oatmeal to cakes, muffins, and cookies.

(iii) Eat more legumes: Pulses (the seeds of plants in the legume family) like beans, lentils and peas are good sources of fiber. You can add them either as a plant-based protein in meatless dishes, or as the starch side instead of grains.

(iv) Include vegetables & fruits in every meal: Fruits and vegetables are high in fiber, as well as vitamins and minerals. Try to eat 5 or more servings each day. For example, eat fruit in breakfast and as a snack, and vegetables at lunch or dinnertime.

[Read here: Top High Fiber Foods]

(v) Opt for nuts, seeds and fruit for snacks: A handful of nuts & dried fruits, low-fat popcorn and whole-grain crackers are great choices as healthy, high-fiber snacks. You can also add them to other items like yogurt, oatmeal, or salads. But keep in mind nuts and dried fruits are high in calories.

About Author: Renu Bakshi, AKA Fitness Buffhq, is ISSA Certified Elite Trainer. He passed Renu Bakshi AKA Fitness BuffhqPersonal Fitness Trainer Course, Nutrition Health Coach course & Specialist Exercise Therapy course from ISSA, USA obtaining + 97% marks. He shares his experience and knowledge about nutrition and effective workouts to get you in the best shape of your life, no matter how old you may be. The author says: “For me age is just a number!”

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