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The Lowdown on Fiber and Why Your Body Really Needs It

Mary Fetzer is a freelance writer and marketing consultant with a marketing degree from Penn State University and 15 years of international business experience. Mary specializes in writing about parenting, children, pregnancy, college, h...

Fiber isn't just a health food buzzword — it's actually really important that you get enough

When it comes to a healthy diet, we are constantly dealing with buzzwords being thrown at us — but it turns out that dietary fiber is much more than just a crazy term or fad that can be ignored. Eating a fiber-rich diet is extremely important and absolutely imperative to keep bodily functions running smoothly.

Yet to most of us, fiber still remains a mystery.

What is fiber?

Fiber is the part of plant foods that your body can't digest or absorb. It is also referred to as roughage or bulk.

"By classification, fiber is considered an indigestible carbohydrate," explains Dr. Elaine Rancatore of 2RHealth.

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But fiber is very different from other carbohydrates — and much lower in calories.

The benefits of fiber

Don't let the term "indigestible" throw you off. Although fiber is not digestible, it is good for the body in many ways, says naturopathic physician Wendy Wells.

"Eating fiber increases the immune system in your gut, feeds the good probiotic bacteria there, keeps the digestive lining healthy and absorbs and pulls out excess hormones, cholesterol, fat and toxins from the body," Wells says.

And pulling out those toxins is part of what make fiber so important.

"Many of the health problems we face start from a poor or sluggish digestion caused from built-up waste material in our colon," says Siv Sjöholm, nutrition expert and founder of Success is Vitality. "Fiber helps us digest and pass the foods we eat. By increasing our fiber intake, we decrease the risks of common diseases such as cardiovascular disease, cancer, diabetes and obesity."

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But the benefits of fiber don't stop there. Nutrition and wellness coach Michelle Pfennighaus outlined these added bonuses:

  • Fiber slows the absorption of sugar into your bloodstream to help maintain stable blood sugar levels and help prevent Type-2 diabetes.
  • Fiber lowers bad LDL cholesterol and promotes heart health.
  • Fiber helps keep you feeling full and satisfied and more in control of your appetite and weight.
  • Fiber keeps your digestive system healthy and regular, helping you to avoid constipation and the risk of diverticulitis.
  • Fiber reduces the risk of certain types of cancer, including colon and breast cancer.

The different types of fiber

There are two types of dietary fiber, and you need both.

Insoluble fiber adds the bulk needed to clean out the colon and regulate bowel movements. This fiber, or roughage, acts like a sponge. As it absorbs water, it swells inside your intestine and produces a feeling of fullness. The insoluble fiber moves through the digestive system to remove waste, toxins and materials your body doesn't need.

Soluble fiber comes from fruit, some vegetables, brown rice, beans, barley peas, lentils, oats and bran. Soluble fiber mixes with water and digestive enzymes made by the liver to create a gel. This gel works chemically to prevent and reduce the body's absorption of substances that may be harmful. It is soluble fiber that helps control blood sugar and reduces cholesterol.

How to eat more

To increase your fiber intake, try adding these foods to your diet:

  • Fruits, vegetables, beans, peas, lentils
  • Nuts and seeds
  • Whole grains

Before you go, check out our slideshow below.

Fiber isn't just a health food buzzword — it's actually really important that you get enough

Originally published April 2012. Updated March 2017.

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