Home
>
Nutrition
>
A Background to Dietary Fiber

A Background to Dietary Fiber

Fiber is the part of the plant that is resistant to hydrolysis (A chemical decomposition in which a substance is split into simpler compounds by the addition or the taking up of the elements of water) by human digestive enzymes and, with the exception of lignin, fibers are complex carbohydrates. These include pectin, gums, mucilages, hemicellulose, polysaccharides cellulose, and nonpolysaccharide lignins. Fibers are water-soluble except cellulose, hemicellulose, and lignin, all of which form part of cell walls. Soluble fibers are sticky and combine with water to form gel-like substances. Pectin is a water-soluble fiber found in soft fruits and vegetables. Gums that are common food additives are also water-soluble, found in stems and seeds of some tropical plants. In general, fruits are higher in pectin and vegetables are higher in cellulose. Although cellulose and hemicellulose are not hydrolyzed, intestinal bacterial can digest some fiber to produce lipid fragments known as short-chain fatty acids. These fatty acids are absorbed in the colon and yield energy when metabolized.

Water Insoluble fibers pass through the gastrointestinal track unchanged, absorbing up to 15 times their weight, important since they provide the digestive tract with 'bulk' that helps facilitate food through the intestines to be evacuated as solid waste; hence, fiber often is called "nature's natural laxative". Cellulose's ability to absorb water produces softer stools and regular bowel movements. Also, insoluble fiber may prevent colon and rectal cancer and help to control diverticulosis (A sac or pouch in the walls of a canal or organ [e.g., GI tract] that becomes inflamed and causes pain and stagnation of feces. Source: The American Dietetic Association's Complete Food & Nutrition Guide, p. 145). Water-soluble fiber, as found in beans, fruit, and oat bran lowers cholesterol by binding to the cholesterol found in liver bile, to help control diabetes.

Overall, dietary fiber does not provide much nourishment to the human diet because of the inability to break down these carb sources for energy, yet reduces available kcalories by providing a sense of satiety and by absorbing some nutrients including fat. However, fiber also absorbs and eliminates essential fatty acids, food substances that are essential for good health and energy metabolism.

Also, dietary fiber may be a detoxifier since it binds with some toxic substances before elimination. But a diet extremely high in fiber is not a good idea since it impairs calcium, iron, and zinc absorption in the intestine.

Increasing fiber should be a gradual process since the majority of fiber products may cause unpleasant bloating, cramps, gas, and other symptoms ? especially if they are eaten in large amounts at once. It is best to add one high fiber food at each eating session to judge whether the food causes symptoms or not. For instance, some people who have problems with brown rice may not have problems with apples, oatmeal, whole wheat bread, or other sources of similar fiber.

Many nutrition authorities estimate that 20-35 grams of fiber daily is a desirable intake for the average individual. Note that the amount of nutrients can vary in wheat products since the refining of grains remove part of the seed (e.g., bran, endosperm, and germ). Here are some fiber-rich sources:

1 ounce dry-roasted peanuts: 2.2 g
1/2 cup cooked broccoli: 2.2 g
1 potato with skin: 2.5 g
1 slice whole wheat bread: 2.8 g
1 cup carrots: 3.0 g
1/2 large grapefruit: 3.1 g
1 apple: 3.5 g
1 cup cooked long-grain brown rice: 3.3 g
1 cup cooked instant oatmeal: 3.5 g
3 cups air-popped popcorn: 3.7 g
1 pear: 4.3 g
_ cup raisins: 4.5 g
1 cup of whole wheat spaghetti cooked: 5 g
1 cup baked beans: 7.0 g
_ cup of chickpeas: 7 g
1 cup boiled lentils: 7.9 g
1 serving bran cereal: 11 g

Here are different sources of fiber and their uses in the body:

CELLULOSE: Fruit legumes, nuts, oat bran, seeds, whole grains, and vegetables. Adds bulk to stool to reduce constipation; oat bran lowers cholesterol; may help control blood sugar; helps weight loss by displacing kcalories.

GUMS: Algae, barley, fruits, legumes, oats, seaweed, seeds, and vegetables. Adds bulk to stool to reduce constipation; may lower blood cholesterol; helps control blood sugar; helps weight loss by displacing kcalories.

HEMICELLULOSE: Fruits, legumes, nuts, oat bran, seeds, whole grains, and vegetables. Adds bulk to stool to reduce constipation; oat bran lowers cholesterol; may help control blood sugar; helps weight loss by displacing kcalories.

LIGNINS: Woody parts of bran, fruit skins, nuts, seeds, whole grains and vegetables. Adds bulk to stool to reduce constipation; may lower blood cholesterol; may help control blood sugar; helps weight loss by displacing kcalories.

MUCILAGES: Plant seeds and secretions. Adds bulk to stool to reduce constipation; may lower blood cholesterol; helps control blood sugar; helps weight loss by displacing kcalories.

PECTINS: Algae, barley, fruits, legumes, oats, seaweed, seeds, and vegetables. Adds bulk to stool to reduce constipation; may lower blood cholesterol; helps control blood sugar; helps weight loss by displacing kcalories.

You may publish this article in your newsletter, on your web site, or other publications, so long as the article's content is not altered and the resource box is included. Add byline and active link. Notification of the use of this article is appreciated, but not required.

Brian D. Johnston is the Director of Education and President of the I.A.R.T. fitness certification and education institute. He has written over 12 books and is a contributing author to the Merck Medical Manual. An international lecturer, Mr. Johnston wears many hats in the fitness and health industries, and can be reached at info@exercisecertification.com.

Visit his site at info@exercisecertification.com for more free articles.

whole house cleaning Highland Park ..

In The News:

Survive flight disruptions with expert travel tips: Book early morning flights, download airline apps and know your refund rights during service cuts.

Apple's iOS 26.1 update delivers major security fixes, performance boosts and enhanced privacy controls for your iPhone. Discover why updating now protects your data.

Russian hackers use fake CAPTCHA tests to spread dangerous malware targeting governments and journalists. Learn how to protect yourself from these deceptive attacks.

Stay up to date on the latest AI technology advancements and learn about the challenges and opportunities AI presents now and for the future.

Miami-Dade debuts America's first autonomous police SUV with AI cameras, drone deployment and real-time crime detection in groundbreaking law enforcement pilot.

Bank impostor scams cost Americans $2.9 billion as criminals use AI voices and caller ID spoofing to steal life savings. Learn nine essential fraud protection tips.

Foreign-owned apps secretly harvest personal data from seniors, making them prime targets for scams. Learn how to protect your privacy and stop data brokers today.

Sens. Josh Hawley and Richard Blumenthal introduce bipartisan GUARD Act to protect minors from AI chatbots through mandatory age verification and disclosure requirements.

Ghost-tapping scammers exploit wireless technology to drain accounts through small transactions, but RFID-blocking wallets and transaction alerts can protect you.

French pilot project demonstrates wireless charging roads that can deliver over 300 kilowatts of power to EVs while driving, potentially eliminating range anxiety.

YouTube's Ghost Network spreads information-stealing malware through thousands of fake videos offering cracked software, using compromised accounts and fake engagement.

Protect your privacy by disabling your smart TV microphone. Most TVs have hidden mics that listen even when voice commands are off. Learn quick steps to stop unwanted audio capture.

SessionReaper vulnerability hits Magento and Adobe Commerce stores, compromising 250+ sites in one day. Hackers steal data and hijack shopping sessions.

Master essential parental controls and digital safety tools to protect your kids online. Learn screen time limits, location settings and privacy controls every parent needs.

Cybersecurity expert shares six essential steps to protect against dark web threats, including data removal services, password managers and antivirus software.

NVIDIA GPU space mission could revolutionize cloud services by enabling orbital data centers that make apps, games and AI tools faster and more efficient.

Stay up to date on the latest AI technology advancements and learn about the challenges and opportunities AI presents now and for the future.

Microsoft warns Windows 10 users face serious security risks as 90% of ransomware attacks target unsupported systems. Learn why upgrading to Windows 11 is crucial.

Nike unveils Project Amplify, revolutionary motorized shoes developed with Dephy that add powered assistance to every step for runners and walkers.

Cybersecurity experts warn about one of the largest credential compilations ever found, urging users to check "Have I Been Pwned" and change passwords immediately.

Quick iPhone and Android battery optimization techniques help your device stay powered all day by turning off hidden features that secretly drain power in the background.

Kodiak Driver autonomous truck achieves perfect 98 safety score, matching top human fleets in groundbreaking AI evaluation by Nauto's VERA system.

New 401k catch-up contribution rules in 2026 will change taxes for high earners over 50. Learn how scammers exploit these changes and protect your retirement savings.

Kurt Knutsson's guide covers social media privacy protection through location settings, account privacy controls and two-factor authentication to prevent scams and data breaches.

Revolutionary retinal implant restores central vision in 80% of patients with advanced macular degeneration, offering hope where treatments once only slowed blindness.