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Home > Nutrition > 5 Health Problems Linked to Fiber Deficiency

5 Health Problems Linked to Fiber Deficiency

March 17, 2020 - Updated on November 22, 2021
9 min read
By Tatiana V. Larionova, MS, CNS, LDN | Licensed Dietitian Nutritionist

In this article:

  • Best Sources of Dietary Fiber
  • How Common Is Fiber Deficiency?
  • Symptoms of Fiber Deficiency
  • Expert Answers (Q&A)
  • Final Word

Fiber is a critically important nutrient in your everyday diet.

consume a fiber-rich diet

Dietary fiber promotes healthy digestion and regularity, improves gut microbiota composition, helps reduce cholesterol and improve cardiovascular health, helps control blood sugar levels and diabetes, tames appetite by keeping you fuller longer and helps regulate weight, and protects you from developing colon cancer. (1)

Sounds like an ultimate multifunction Superdrug, sans the high cost and nasty side effects.

Best Sources of Dietary Fiber

Fiber is found in virtually all fruits, vegetables, legumes, and grains in their unprocessed, whole form, making it so ubiquitously available and affordable.

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How Common Is Fiber Deficiency?

So why is it that most Americans statistically do not get enough fiber in their diet? (2)

Because the standard American diet does not offer enough fiber to satisfy the requirement range of 25–38 grams per day by the Institute of Medicine Dietary Reference Intake (DRI). (3)

Interestingly, however, most surveyed individuals are convinced they are getting enough fiber. Since most people do not engage in macro, micro, calorie, and other nutrient counting, how would they know if they are indeed eating enough fiber!

Symptoms of Fiber Deficiency

Let’s explore some of the signs your body is trying to tell you when you lack sufficient fiber in your diet.

1. Constipation

Fiber greatly supports regular bowel movements by bulking up stool, improving motility (promoting movement down the digestive tract), and promoting laxation and lubrication through its gel-forming properties. (4)

If you experience frequent constipation, try adding more fiber – that is, more vegetables, fruits, legumes, and grains – in your diet for improved regularity.

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2. Diarrhea

Although a lack of fiber in your diet does not directly cause diarrhea, it may reduce the diversity and amount of beneficial bacteria in your gut that protects you from infectious diseases and promote overall health. (5)

The fiber in such plant foods as asparagus, artichokes, onion, garlic, oats, and bananas is a prebiotic – a nutrient that feeds and supports friendly bacteria in your gut.

See the chain reaction? Prebiotic fiber feeds good bacteria that prevent diarrhea. (6)

ALSO READ: Foods to Avoid When You Have Diarrhea

3. Overweight and obesity

eating fiber-rich diet can help regulate your weight

Consuming sufficient amounts of fiber guarantees satiety and fullness, which reduces appetite and consumption of calorie-laden foods. (7)

Fibrous foods usually have low caloric density but greater volume, which makes them ideal for appetite control and weight loss. Plus, eating high-fiber foods makes you full quickly and slows the release of sugar into your bloodstream, thus keeping your blood sugar level stable along with your appetite.

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A high-fiber diet is known to reduce the caloric load by preventing some calories from being absorbed in the intestines, therefore aiding weight loss. (8)

Another way dietary fiber may reduce appetite and help regulate weight is by stimulating the release of the appetite-suppressing hormone leptin through a series of complex neurochemical signaling events. (9)

Leptin is released from your fat cells in response to meals. It downregulates your appetite and stops you from overeating. (9)

4. Hunger pangs

Insufficient fiber intake will cause hunger pangs shortly after meals.

Not only will your smart body recognize that you are not feeding it enough of this vital nutrient, but the mechanoreceptors in your gut (those that sense stretching of your stomach and intestines) will also register low content and mount a hunger signal up to your brain. (10)

By eating adequate amounts of fiber, you ensure satiety for longer and keep your caloric intake within reasonable need.

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ALSO READ:

  • Reduce Hunger Pangs, Check Calories, and Control Your Weight
  • How to Deal with Cravings, Reduce Hunger, and Eat Less

5. Drop in blood sugar

Hypoglycemia, or the rapid drop in blood sugar, could be caused by several different reasons. These include preexisting conditions such as type I and type II diabetes, prolonged periods of fasting, or a high-sugar low-fiber diet.

Symptoms of low blood sugar levels include extreme fatigue, shakiness, blurry vision, and cravings for sweet food. These are normally relieved by eating foods containing carbs or drinking juice or soda.

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Consuming high amounts of simple carbohydrates (candy, pastries, soda) without accompanying high-fiber foods will spike your blood glucose level, followed by a sudden drop as the insulin response kicks in. (11)

At this point, your body senses a dip in energy and sends you hunger signals to replenish it. This is not true hunger, however. The body is just not very good at recognizing that you have had enough calories with your high-sugar snack.

The consequences of a high-sugar diet then become a vicious cycle of “eating sugar–hypoglycemia–need for more sugar to stabilize.” By including more fiber in your diet, you will train your body to avoid sudden blood glucose drops and only heed the true need for energy.

Expert Answers (Q&A)

Answered by Olivia DiPio, LD (Registered Dietitian Nutritionist)

experts advice on ways to include fiber in your diet
Do dark-colored vegetables contain more fiber?

Overall, darker vegetables tend to have more fiber, but there are exceptions to the rule. Most of the time, the higher the intensity of the color, the more nutrients the food item contains.

Rich-colored vegetables such as beets, carrots, and broccoli have a lot of fiber. An example of the exception is artichokes, which are more of a light brown. One medium-sized artichoke contains around 10 g of fiber.

What foods are known to help clear out the digestive track?

If you are feeling sluggish and bloated, it is most likely because your digestive tract is not at its healthiest. Consuming more fiber, water and probiotics can help promote the growth of healthy gut bacteria that facilitate better digestion and regular bowel movement.

The daily recommended intake of fiber is 25 g/day for women and 38 g/day for men. Fruits and vegetables are good sources of fiber and water. (12)

The skins of fruits and vegetables are where most of the fiber is from. For example, one apple contains 4 g of fiber. If you work out or have a laborious job, increase your usual water intake by 2 cups.

Lastly, probiotics keep your gut filled with good bacteria that support its function. (13) Popular food sources of probiotics include yogurt, kombucha, sauerkraut, and miso.

Do not use supplements, pills, or teas that claim they will “clear you out” or “give you a flatter stomach.” These are quick fixes that will not improve your gut health and can put you at risk for other medical issues.

What are the best ways to increase fiber in the diet?

The best way to increase fiber intake is to make sure that every meal has at least two different vegetables on your plate and to make sure half of your plate is fruits or vegetables. These portions will ensure that you are getting a variety of nutrients and both types of fiber.

What fibrous foods are best for breakfast?

Oats are a great high-fiber breakfast option. It is a myth that steel-cut oats are better than rolled oats or quick oats. They all carry a similar nutrient profile, including their fiber content. Rolled oats and quick oats have about 5 g of fiber, whereas steel-cut oats have around 6 g of fiber.

Consuming apples and berries are a great way to add fiber to your morning meals. They can be easily added to yogurt and oats for a quick breakfast.

Nuts and seeds also provide a good amount of fiber in your diet. They can be added to smoothies, yogurt, oatmeal, and a variety of recipes.

Should fiber-rich foods be eaten on an empty stomach?

Yes, there is no bad time to eat fiber. You may consume fiber anytime or any way!

What are the side effects of a fiber-rich diet?

The word “side effects” to describe a nutrient is a bad connotation; the best word would be “symptom.” The negative symptoms associated with consuming fiber are bloating and gas.

These symptoms most commonly occur when individuals make an extreme lifestyle change for the better or have an extremely high-fiber meal. For example, if someone followed a highly-processed diet and then started eating loads of fruits and vegetables, their discomfort may be extreme.

But overall, fiber is great for your gut! It will help the transit time of food and keep you feeling full longer. As a result, you feel healthy and stay at a healthy weight.

What fiber-rich foods should be included in the diet if one is suffering from constipation?

Insoluble fiber helps add bulk to the stool and facilitates fast elimination through the intestines. Some examples of foods with a good amount of insoluble fiber are whole grains, nuts, seeds, fruit with skin, and certain vegetables.

How to choose fiber for a healthy diet?

• Have two different vegetables or fruits at each meal.
• Try to have those vegetables that are of two different colors.
• Choose whole grains over refined grains.
• Snack on seeds and nuts, but remember portion control.
• Juice does not have fiber, so consume whole fruits and vegetables instead.
• Rinse and eat apples, cucumber, and potatoes with their skin on.
• Eat your legumes – beans, lentils, and chickpeas.

About Olivia DiPio, RDN: Olivia is a wellness dietitian in the Cleveland area. She is a certified dietitian who wants to help individuals create the best version of themselves. She currently works for Eurest, helping large companies establish a wellness environment.

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Final Word

To ensure sufficient fiber in your diet, try to include fiber-rich foods at every meal. Have fresh fruits and berries along with whole grains such as oats as part of your breakfast. Opt for a green salad and baked starchy veggies such as sweet potatoes, beans, and lentils with your lunch.

Chilies and stews with lots of veggies served over brown rice, quinoa, or whole-grain pasta are great for dinner. For snacks, nuts, seeds, or fruits with nut butter are some high-fiber options to try.

References
  1. Anderson JW, Baird P, Davis RH, et al. Health benefits of dietary fiber. Nutrition reviews. https://www.ncbi.nlm.nih.gov/pubmed/19335713. Published April 2009.
  2. Quagliani D, Felt-Gunderson P. Closing America’s Fiber Intake Gap: Communication Strategies From a Food and Fiber Summit. American journal of lifestyle medicine. http://www.ncbi.nlm.nih.gov/pubmed/30202317. Published July 7, 2016.
  3. 2010 Dietary Guidelines. Home of the Office of Disease Prevention and Health Promotion. https://health.gov/our-work/food-nutrition/previous-dietary-guidelines/2010.
  4. Lambeau KV, McRorie JW. Fiber supplements and clinically proven health benefits: How to recognize and recommend an effective fiber therapy. Journal of the American Association of Nurse Practitioners. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5413815/. Published April 2017.
  5. Slavin J. Fiber and prebiotics: mechanisms and health benefits. Nutrients. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3705355/. Published April 22, 2013.
  6. Holscher HD. Dietary fiber and prebiotics and the gastrointestinal microbiota. Gut microbes. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5390821/. Published March 4, 2017.
  7. Rebello CJ, O’Neil CE, Greenway FL. Dietary fiber and satiety: the effects of oats on satiety. Nutrition reviews. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4757923/. Published February 2016.
  8. Gilhooly CH, Das SK, Golden JK, et al. Use of cereal fiber to facilitate adherence to a human caloric restriction program. Aging clinical and experimental research. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2869218/. Published December 2008.
  9. Miller GD. Appetite Regulation: Hormones, Peptides, and Neurotransmitters and Their Role in Obesity. American journal of lifestyle medicine. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6796227/. Published June 23, 2017.
  10. Williams EK, Chang RB, Strochlic DE, Umans BD, Lowell BB, Liberles SD. Sensory Neurons that Detect Stretch and Nutrients in the Digestive System. Cell. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4930427/. Published June 30, 2016.
  11. Fujii H, Iwase M, Ohkuma T, et al. Impact of dietary fiber intake on glycemic control, cardiovascular risk factors and chronic kidney disease in Japanese patients with type 2 diabetes mellitus: the Fukuoka Diabetes Registry. Nutrition journal. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3878841/. Published December 11, 2013.
  12. Slavin JL, Lloyd B. Health benefits of fruits and vegetables. Advances in nutrition (Bethesda, Md.). https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3649719/. Published July 1, 2012.
  13. Hemarajata P, Versalovic J. Effects of probiotics on gut microbiota: mechanisms of intestinal immunomodulation and neuromodulation. Therapeutic advances in gastroenterology. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3539293/. Published January 2013.
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