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Fiber Contributions by ColleenO

Article Revisions

It is easy to increase the fiber in your diet—it just takes a little thought and some action. diet. The best option is to increase your consumption of fiber-rich foods--that way, you're getting your fiber as well as the other beneficial components of fruits and vegetables, whole grains, etc. Another option is to take fiber supplements, such as glucomannan and psyllium.

Here are a few ideas to help you get on track to 30 grams of fiber a day. :

  • Try a whole grain cereal that contains at least 5 grams of fiber per serving. Slice a banana on top, or add some raisins or berries to increase the fiber even more. Sprinkle a few teaspoons of wheat germ, ground psyllium, or ground flaxseed on your food.
  • Try eating some vegetables raw. Cooking can break down some of the fiber content. If you do cook vegetables, steam them lightly, so they are tender but still firm.
  • Leave the skin on fruits and vegetables. Just make sure you rinse them well with warm water to remove any dirt or bacteria.
  • Eat the whole fruit or vegetable instead of drinking the juice made from it. Juice does not contain the skin or membrane of the fruit or vegetable, and therefore its fiber content is substantially reduced.
  • Try adding whole, unprocessed grain to your diet. Substitute brown rice for white rice. Or opt for whole wheat bread or pasta.
  • Add beans to your soups, salads, and stews. Throw some beans on top of a salad or add lentils to soup while cooking.
  • Snack on fresh and dried fruit. Chomp some raisins or dried apricots in the afternoon, instead of a bag of potato chips or pretzels.

A really important thing to keep in mind:

When you begin to increase the fiber in your diet, take it slow. ! Increasing too quickly can upset your intestinal tract and you may experience gas, bloating, cramps, or even constipation or diarrhea. By increasing your fiber intake just a few grams a day, your intestinal tract will have time to adjust. Other tips to help minimize upset include:

  • Drink at least eight 8-ounce cups of water a day.
  • Use enzyme products, such as Beano, to help you digest fiber.
  • Do not cook dried beans in the same water in which you soaked them.
... (more)
Edited Fiber Overview: References 13 years ago

American Dietetic Association website. Available at: http://www.eatright.org . Accessed February 19, 2009.

Fiber. American Heart Association website. Available at: http://www.americanheart.org/presenter.jhtml?identifier=4574 . Accessed February 19, 2009.

Flax—a healthy food. Flax Council of Canada website. Available at: http://www.flaxcouncil.ca/english/index.jsp?p=g1mp=nutrition. Accessed April 21, 2010.

Flaxseed. EBSCO Natural and Alternative Treatments website. Available at: http://www.ebscohost.com/thisTopic.php?marketID=15topicID=114. Updated February 2010. Accessed April 21, 2010.

Shamliyan T, Jacobs D, Raatz S, Nordstrom D, Keenan J. Are your patients with risk of CVD getting the viscous soluble fiber they need? Journal of Family Practice. 2006;9:761-769. EBSCO Consumer Health Complete website. Available at: http://www.ebscohost.com/thisTopic.php?marketID=15topicID=114. Published September 2006. Accessed April 20, 2010.

... (more)

It is easy to increase the fiber in your diet. The best option is to increase your consumption of fiber-rich foods--that way, you're getting your fiber as well as the other beneficial components of fruits and vegetables, whole grains, etc. Another option is to take fiber supplements, such as glucomannan and psyllium.

Here are a few ideas to help you get on track to 30 grams of fiber a day:

  • Try a whole grain cereal that contains at least 5 grams of fiber per serving. Slice a banana on top, or add some raisins or berries to increase the fiber even more. Sprinkle a few teaspoons of wheat germ, ground psyllium, or ground flaxseed on your food.
  • Try eating some vegetables raw. Cooking can break down some of the fiber content. If you do cook vegetables, steam them lightly, so they are tender but still firm.
  • Leave the skin on fruits and vegetables. Just make sure you rinse them well with warm water to remove any dirt or bacteria.
  • Eat the whole fruit or vegetable instead of drinking the juice made from it. Juice does not contain the skin or membrane of the fruit or vegetable, and therefore its fiber content is substantially reduced.
  • Try adding whole, unprocessed grain to your diet. Substitute brown rice for white rice. Or opt for whole wheat bread or pasta.
  • Add beans to your soups, salads, and stews. Throw some beans on top of a salad or add lentils to soup while cooking.
  • Snack on fresh and dried fruit. Chomp some raisins or dried apricots in the afternoon, instead of a bag of potato chips or pretzels.

A really important thing to keep in mind:

When you begin to increase the fiber in your diet, take it slow! Increasing too quickly can upset your intestinal tract and you may experience gas, bloating, cramps, or even constipation or diarrhea. By increasing your fiber intake just a few grams a day, your intestinal tract will have time to adjust. Other tips to help minimize upset include:

  • Drink at least eight 8-ounce cups of water a day.
  • Use enzyme products, such as Beano, to help you digest fiber.
  • Do not cook dried beans in the same water in which you soaked them.
... (more)

Health experts recommend eating a minimum of 20-30 grams of fiber daily. This includes both soluble and insoluble fiber. Most Americans eat about 11-15 grams a day—about half of what is recommended. A quick internet search will provide you with lists of how much fiber you can find in common foods.

... (more)
Edited Fiber Overview: Overview 13 years ago

Most people know that fiber is an important part of a healthy diet. Fiber has been found to have numerous health benefits, from supporting bowel regularity to lowering cholesterol. Fiber might also help prevent serious diseases such as diabetes and cancer.

When it comes to increasing fiber in your diet, think plants--grains, fruits and vegetables, and beans, seeds, nuts and legumes. Fiber is found only in plants. It is from the plant cells, particularly the cell walls. The plant fiber that we eat is called dietary fiber. It is unique from other components of the plant because humans lack the enzymes necessary to digest it.

There are two types of fiber: soluble and insoluble. Soluble means that when the fiber is mixed with a liquid, it forms a gel-like solution. Insoluble fiber, on the other hand, does not mix with liquid, and it passes through the digestive tract largely intact. Both types of fiber help maintain bowel regularity.

  • Soluble fiber has been found to provide some additional health benefits. When eaten as part of a low-fat, low-cholesterol diet, soluble fiber can help lower cholesterol. Weaker and somewhat inconsistent evidence hints at a link between soluble fiber intake and a reduced risk of certain cancers, diabetes, digestive disorders, and heart disease.
    • Examples of foods high in soluble fiber include pears, Brussels sprouts, lima beans, Northern beans, and psyllium.
  • Insoluble fiber is important for normal digestive health. Insoluble fiber speeds up movement through the small intestine and helps to alleviate constipation.
    • Foods that are high in insoluble fiber include apples, beans (eg, black beans, navy beans, pinto beans), lentils, All Bran cereal, wheat germ, and brown rice.

Flaxseed, a source of both soluble and insoluble fiber, has being studied for its ability to lower cholesterol and decrease constipation. Researchers are also investigating whether these seeds have anti-cancer properties. Just one tablespoon of ground flaxseed provides 2.2 grams of total fiber, as well as 1.8 grams of alpha-linolenic acid, a type of omega-3 fatty acid.

... (more)

You See the chitosan article and the glucommanan article for more information on these forms of fiber.

As for soluble fiber, you can incorporate more soluble fiber into your diet by taking supplements and/or increasing your intake of foods that are good sources of soluble fiber, such:

  • Oats and barley
  • Beans and peas
  • Nuts
  • Flax seeds
  • Fruits such as oranges and apples
  • Vegetables such as carrots

A typical dose of oat bran is 5 to 10 g with each meal and at bedtime; psyllium is taken at 10 g with each meal. For improving total and LDL cholesterol, studies have found benefit with beta-glucan at doses ranging from 3 to 15 grams daily. However, benefits have been seen more consistently at the higher end of this range, and one carefully designed study found no benefit at 3 grams daily.33

Beta-glucan products can contain molecules of various average lengths (molecular weight). Some manufacturers claim superior benefits with either high or low molecular weight versions. However, one study failed to find any difference between high molecular weight and low molecular weight beta-glucan for normalizing cholesterol and blood sugar levels.34

... (more)
  1. Glore SR, Van Treeck D, Knehans AW, et al. Soluble fiber and serum lipids: a literature review. J Am Diet Assoc. 1994;94:425-436.
  2. Lovegrove JA, Clohessy A, Milon H, et al. Modest doses of beta-glucan do not reduce concentrations of potentially atherogenic lipoproteins. Am J Clin Nutr. 2000;72:49-55.
  3. Frank J, Sundberg B, Kamal-Eldin, A et al. Yeast-leavened oat breads with high or low molecular weight beta-glucan do not differ in their effects on blood concentrations of lipids, insulin, or glucose in humans. J Nutr. 2004;134:1384-1388.
  4. Maezaki Y, Tsuji K, Nakagawa Y, et al. Hypocholesterolemic effect of chitosan in adult males. Biosci Biotechnol Biochem. 1993;57:1439-1444.
  5. Jing SB, Li L, Ji D, et al. Effect of chitosan on renal function in patients with chronic renal failure. J Pharm Pharmacol. 1997;49:721-723.
  6. Ormrod D, Holmes CC, Miller TE. Dietary chitosan inhibits hypercholesterolaemia and atherogenesis in the apolipoprotein E-deficient mouse model of atherosclerosis. Atherosclerosis. 1998;138:329-334.
  7. Deuchi K, Kanauchi O, Imasato Y, et al. Decreasing effect of chitosan on the apparent fat digestibility by rats fed on a high-fat diet. Biosci Biotechnol Biochem. 1994;58:1613-1616.
  8. Deuchi K, Kanauchi O, Imasato Y, et al. Effect of the viscosity or deacetylation degree of chitosan on fecal fat excreted from rats fed on a high-fat diet. Biosci Biotechnol Biochem. 1995;59:781-785.
  9. Deuchi K, Kanauchi O, Shizukuishi M, et al. Continuous and massive intake of chitosan affects mineral and fat-soluble vitamin status in rats fed on a high-fat diet. Biosci Biotechnol Biochem. 1995;59:1211-1216.
  10. Kanauchi O, Deuchi K, Imasato Y, et al. Increasing effect of a chitosan and ascorbic acid mixture on fecal dietary fat excretion. Biosci Biotechnol Biochem. 1994;58:1617-1620.
  11. Kobayashi T, Otsuka S, Yugari Y. Effect of chitosan on serum and liver cholesterol levels in cholesterol-fed rats. Nutr Rep Int. 1979;19:327-334.
  12. Ho SC, Tai ES, Eng PH, et al. In the absence of dietary surveillance, chitosan does not reduce plasma lipids or obesity in hypercholesterolaemic obese Asian subjects. Singapore Med J. 2001;42:6-10.
  13. Tai TS, Sheu WH, Lee WJ, et al. Effect of chitosan on plasma lipoprotein concentrations in type 2 diabetic subjects with hypercholesterolemia [letter]. Diabetes Care. 2000;23:1703-1704.
  14. Wuolijoki E, Hirvela T, Ylitalo P. Decrease in serum LDL cholesterol with microcrystalline chitosan. Methods Find Exp Clin Pharmacol. 1999;21:357-361.
  15. Bokura H, Kobayashi S. Chitosan decreases total cholesterol in women: a randomized, double-blind, placebo-controlled trial. Eur J Clin Nutr. 2003;57:721-725.
  16. Metso S, Ylitalo R, Nikkila M, et al. The effect of long-term microcrystalline chitosan therapy on plasma lipids and glucose concentrations in subjects with increased plasma total cholesterol: a randomised placebo-controlled double-blind crossover trial in healthy men and women. Eur J Clin Pharmacol. 2003 Nov 7. [Epub ahead of print]
  17. Guha S, Pal SK, Chatterjee N, et al. Effect of chitosan on lipid levels when administered concurrently with atorvastatin—a placebo controlled study. J Indian Med Assoc. 2005;103:418,420.
  18. Lehtimaki T, Metso S, Ylitalo R, et al. Microcrystalline chitosan is ineffective to decrease plasma lipids in both apolipoprotein E epsilon4 Carriers and non-carriers: a long-term placebo-controlled trial in hypercholesterolaemic volunteers. Basic Clin Pharmacol Toxicol. 2005;97:98-103.
  19. Queenan KM, Stewart ML, Smith KN, et al. Concentrated oat beta-glucan, a fermentable fiber, lowers serum cholesterol in hypercholesterolemic adults in a randomized controlled trial. Nutr J. 2007 Mar 26. [Epub ahead of print].
  20. Kelly S, Summerbell C, Brynes A, et al. Wholegrain cereals for coronary heart disease. Cochrane Database Syst Rev. 2007 Apr 18;CD005051.
  21. Woodgate D, Chan CH, Conquer JA. Cholesterol-lowering ability of a phytostanol softgel supplement in adults with mild to moderate hypercholesterolemia. Lipids. 2006;41:127-132.
  22. Tapola NS, Lyyra ML, Kolehmainen RM, et al. Safety aspects and cholesterol-lowering efficacy of chitosan tablets. J Am Coll Nutr. 2008;27:22-30.
  23. Sood N, Baker WL, Coleman CI. Effect of glucomannan on plasma lipid and glucose concentrations, body weight, and blood pressure: systematic review and meta-analysis. Am J Clin Nutr. 2008;88:1167-1175.
  24. Wei ZH, Wang H, Chen XY, et al. Time- and dose-dependent effect of psyllium on serum lipids in mild-to-moderate hypercholesterolemia: a meta-analysis of controlled clinical trials. Eur J Clin Nutr. 2008 Nov 5.
... (more)

A comprehensive review combining the results of 14 studies found that glucomannan significantly reduced total and LDL cholesterol levels.289

Many studies indicate that water-soluble fiber supplements lower cholesterol.253,263,291 Keep in mind that the bulk of the supporting evidence for this theory comes from studies of oats conducted by manufacturers of oat products.255

Current evidence suggests that if chitosan does offer any benefits, they are minimal at best.84-92,147,148,187,197,225-226,285

... (more)

Water-soluble fiber supplements (such as psyllium, hydroxymethylcellulose and its relatives, and beta glucan from oats) are thought to lower cholesterol, and the FDA has permitted products containing this form of fiber to carry a "heart-healthy" label.31 It must be kept in mind, however, that the bulk of the supporting evidence for this theory comes from studies of oats conducted by manufacturers of oat products.255

Glucomannan, a dietary fiber derived from the tubers of Amorphophallus konjac, has been shown to significantly reduce total and LDL cholesterol levels.

Chitosan, a type of insoluble fiber derived from crustacean shells, has been proposed for reducing cholesterol levels. Research is not yet very encouraging for using chitosan for this purpose.

... (more)

Enter section content...

Experts believe that soluble fiber reduces cholesterol levels by increasing excretion of cholesterol from the digestive tract. This affects two forms of cholesterol: cholesterol from food, and, more importantly, cholesterol from the blood “recycled” by the liver through the intestines.

... (more)
  • Integrative MD
  • Nutritionist or dietitian
  • Naturopathic doctor
... (more)

Because it occurs naturally in foods and is a part of most people's regular diet, fiber is considered to be generally safe at normal amounts. Some people do experience digestive upset (stomach ache, cramps, and/or diarrhea) when they increase their intake of fiber. To avoid this, increase your intake gradually so your body has time to adjust.

There are some theoretical concerns about the use of beta-glucan and its potential effects on the immune system. For more information, see the the Side Effects & Warnings section of the beta glucan article.

... (more)
  1. Glore SR, Van Treeck D, Knehans AW, et al. Soluble fiber and serum lipids: a literature review. J Am Diet Assoc. 1994;94:425-436.
  2. Lovegrove JA, Clohessy A, Milon H, et al. Modest doses of beta-glucan do not reduce concentrations of potentially atherogenic lipoproteins. Am J Clin Nutr. 2000;72:49-55.
  3. Frank J, Sundberg B, Kamal-Eldin, A et al. Yeast-leavened oat breads with high or low molecular weight beta-glucan do not differ in their effects on blood concentrations of lipids, insulin, or glucose in humans. J Nutr. 2004;134:1384-1388.
  4. Maezaki Y, Tsuji K, Nakagawa Y, et al. Hypocholesterolemic effect of chitosan in adult males. Biosci Biotechnol Biochem. 1993;57:1439-1444.
  5. Jing SB, Li L, Ji D, et al. Effect of chitosan on renal function in patients with chronic renal failure. J Pharm Pharmacol. 1997;49:721-723.
  6. Ormrod D, Holmes CC, Miller TE. Dietary chitosan inhibits hypercholesterolaemia and atherogenesis in the apolipoprotein E-deficient mouse model of atherosclerosis. Atherosclerosis. 1998;138:329-334.
  7. Deuchi K, Kanauchi O, Imasato Y, et al. Decreasing effect of chitosan on the apparent fat digestibility by rats fed on a high-fat diet. Biosci Biotechnol Biochem. 1994;58:1613-1616.
  8. Deuchi K, Kanauchi O, Imasato Y, et al. Effect of the viscosity or deacetylation degree of chitosan on fecal fat excreted from rats fed on a high-fat diet. Biosci Biotechnol Biochem. 1995;59:781-785.
  9. Deuchi K, Kanauchi O, Shizukuishi M, et al. Continuous and massive intake of chitosan affects mineral and fat-soluble vitamin status in rats fed on a high-fat diet. Biosci Biotechnol Biochem. 1995;59:1211-1216.
  10. Kanauchi O, Deuchi K, Imasato Y, et al. Increasing effect of a chitosan and ascorbic acid mixture on fecal dietary fat excretion. Biosci Biotechnol Biochem. 1994;58:1617-1620.
  11. Kobayashi T, Otsuka S, Yugari Y. Effect of chitosan on serum and liver cholesterol levels in cholesterol-fed rats. Nutr Rep Int. 1979;19:327-334.
  12. Ho SC, Tai ES, Eng PH, et al. In the absence of dietary surveillance, chitosan does not reduce plasma lipids or obesity in hypercholesterolaemic obese Asian subjects. Singapore Med J. 2001;42:6-10.
  13. Tai TS, Sheu WH, Lee WJ, et al. Effect of chitosan on plasma lipoprotein concentrations in type 2 diabetic subjects with hypercholesterolemia [letter]. Diabetes Care. 2000;23:1703-1704.
  14. Wuolijoki E, Hirvela T, Ylitalo P. Decrease in serum LDL cholesterol with microcrystalline chitosan. Methods Find Exp Clin Pharmacol. 1999;21:357-361.
  15. Bokura H, Kobayashi S. Chitosan decreases total cholesterol in women: a randomized, double-blind, placebo-controlled trial. Eur J Clin Nutr. 2003;57:721-725.
  16. Metso S, Ylitalo R, Nikkila M, et al. The effect of long-term microcrystalline chitosan therapy on plasma lipids and glucose concentrations in subjects with increased plasma total cholesterol: a randomised placebo-controlled double-blind crossover trial in healthy men and women. Eur J Clin Pharmacol. 2003 Nov 7. [Epub ahead of print]
  17. Guha S, Pal SK, Chatterjee N, et al. Effect of chitosan on lipid levels when administered concurrently with atorvastatin—a placebo controlled study. J Indian Med Assoc. 2005;103:418,420.
  18. Lehtimaki T, Metso S, Ylitalo R, et al. Microcrystalline chitosan is ineffective to decrease plasma lipids in both apolipoprotein E epsilon4 Carriers and non-carriers: a long-term placebo-controlled trial in hypercholesterolaemic volunteers. Basic Clin Pharmacol Toxicol. 2005;97:98-103.
  19. Queenan KM, Stewart ML, Smith KN, et al. Concentrated oat beta-glucan, a fermentable fiber, lowers serum cholesterol in hypercholesterolemic adults in a randomized controlled trial. Nutr J. 2007 Mar 26. [Epub ahead of print].
  20. Kelly S, Summerbell C, Brynes A, et al. Wholegrain cereals for coronary heart disease. Cochrane Database Syst Rev. 2007 Apr 18;CD005051.
  21. Woodgate D, Chan CH, Conquer JA. Cholesterol-lowering ability of a phytostanol softgel supplement in adults with mild to moderate hypercholesterolemia. Lipids. 2006;41:127-132.
  22. Tapola NS, Lyyra ML, Kolehmainen RM, et al. Safety aspects and cholesterol-lowering efficacy of chitosan tablets. J Am Coll Nutr. 2008;27:22-30.
  23. Sood N, Baker WL, Coleman CI. Effect of glucomannan on plasma lipid and glucose concentrations, body weight, and blood pressure: systematic review and meta-analysis. Am J Clin Nutr. 2008;88:1167-1175.
  24. Wei ZH, Wang H, Chen XY, et al. Time- and dose-dependent effect of psyllium on serum lipids in mild-to-moderate hypercholesterolemia: a meta-analysis of controlled clinical trials. Eur J Clin Nutr. 2008 Nov 5.
... (more)

See the chitosan article and the glucommanan article for more information on these forms of fiber.

As for soluble fiber, you can incorporate more into your diet by taking supplements and/or increasing your intake of foods that are good sources of soluble fiber, such:

  • Oats and barley
  • Beans and peas
  • Nuts
  • Flax seeds
  • Fruits such as oranges and apples
  • Vegetables such as carrots

A typical dose of oat bran is 5 to 10 g with each meal and at bedtime; psyllium is taken at 10 g with each meal. For improving total and LDL cholesterol, studies have found benefit with beta-glucan at doses ranging from 3 to 15 grams daily. However, benefits have been seen more consistently at the higher end of this range, and one carefully designed study found no benefit at 3 grams daily.33

Beta-glucan products can contain molecules of various average lengths (molecular weight). Some manufacturers claim superior benefits with either high or low molecular weight versions. However, one study failed to find any difference between high molecular weight and low molecular weight beta-glucan for normalizing cholesterol and blood sugar levels.34

... (more)

Because it occurs naturally in foods and is a part of most people's regular diet, fiber is considered to be generally safe at normal amounts. Some people do experience digestive upset (stomach ache, cramps, and/or diarrhea) when they increase their intake of fiber. To avoid this, increase your intake gradually so your body has time to adjust.

There are some theoretical concerns about the use of beta-glucan and its potential effects on the immune system. For more information, see the the Side Effects & Warnings section of the beta glucan article.

... (more)
  1. Glore SR, Van Treeck D, Knehans AW, et al. Soluble fiber and serum lipids: a literature review. J Am Diet Assoc. 1994;94:425-436.
  2. Lovegrove JA, Clohessy A, Milon H, et al. Modest doses of beta-glucan do not reduce concentrations of potentially atherogenic lipoproteins. Am J Clin Nutr. 2000;72:49-55.
  3. Frank J, Sundberg B, Kamal-Eldin, A et al. Yeast-leavened oat breads with high or low molecular weight beta-glucan do not differ in their effects on blood concentrations of lipids, insulin, or glucose in humans. J Nutr. 2004;134:1384-1388.
  4. Maezaki Y, Tsuji K, Nakagawa Y, et al. Hypocholesterolemic effect of chitosan in adult males. Biosci Biotechnol Biochem. 1993;57:1439-1444.
  5. Jing SB, Li L, Ji D, et al. Effect of chitosan on renal function in patients with chronic renal failure. J Pharm Pharmacol. 1997;49:721-723.
  6. Ormrod D, Holmes CC, Miller TE. Dietary chitosan inhibits hypercholesterolaemia and atherogenesis in the apolipoprotein E-deficient mouse model of atherosclerosis. Atherosclerosis. 1998;138:329-334.
  7. Deuchi K, Kanauchi O, Imasato Y, et al. Decreasing effect of chitosan on the apparent fat digestibility by rats fed on a high-fat diet. Biosci Biotechnol Biochem. 1994;58:1613-1616.
  8. Deuchi K, Kanauchi O, Imasato Y, et al. Effect of the viscosity or deacetylation degree of chitosan on fecal fat excreted from rats fed on a high-fat diet. Biosci Biotechnol Biochem. 1995;59:781-785.
  9. Deuchi K, Kanauchi O, Shizukuishi M, et al. Continuous and massive intake of chitosan affects mineral and fat-soluble vitamin status in rats fed on a high-fat diet. Biosci Biotechnol Biochem. 1995;59:1211-1216.
  10. Kanauchi O, Deuchi K, Imasato Y, et al. Increasing effect of a chitosan and ascorbic acid mixture on fecal dietary fat excretion. Biosci Biotechnol Biochem. 1994;58:1617-1620.
  11. Kobayashi T, Otsuka S, Yugari Y. Effect of chitosan on serum and liver cholesterol levels in cholesterol-fed rats. Nutr Rep Int. 1979;19:327-334.
  12. Ho SC, Tai ES, Eng PH, et al. In the absence of dietary surveillance, chitosan does not reduce plasma lipids or obesity in hypercholesterolaemic obese Asian subjects. Singapore Med J. 2001;42:6-10.
  13. Tai TS, Sheu WH, Lee WJ, et al. Effect of chitosan on plasma lipoprotein concentrations in type 2 diabetic subjects with hypercholesterolemia [letter]. Diabetes Care. 2000;23:1703-1704.
  14. Wuolijoki E, Hirvela T, Ylitalo P. Decrease in serum LDL cholesterol with microcrystalline chitosan. Methods Find Exp Clin Pharmacol. 1999;21:357-361.
  15. Bokura H, Kobayashi S. Chitosan decreases total cholesterol in women: a randomized, double-blind, placebo-controlled trial. Eur J Clin Nutr. 2003;57:721-725.
  16. Metso S, Ylitalo R, Nikkila M, et al. The effect of long-term microcrystalline chitosan therapy on plasma lipids and glucose concentrations in subjects with increased plasma total cholesterol: a randomised placebo-controlled double-blind crossover trial in healthy men and women. Eur J Clin Pharmacol. 2003 Nov 7. [Epub ahead of print]
  17. Guha S, Pal SK, Chatterjee N, et al. Effect of chitosan on lipid levels when administered concurrently with atorvastatin—a placebo controlled study. J Indian Med Assoc. 2005;103:418,420.
  18. Lehtimaki T, Metso S, Ylitalo R, et al. Microcrystalline chitosan is ineffective to decrease plasma lipids in both apolipoprotein E epsilon4 Carriers and non-carriers: a long-term placebo-controlled trial in hypercholesterolaemic volunteers. Basic Clin Pharmacol Toxicol. 2005;97:98-103.
  19. Queenan KM, Stewart ML, Smith KN, et al. Concentrated oat beta-glucan, a fermentable fiber, lowers serum cholesterol in hypercholesterolemic adults in a randomized controlled trial. Nutr J. 2007 Mar 26. [Epub ahead of print].
  20. Kelly S, Summerbell C, Brynes A, et al. Wholegrain cereals for coronary heart disease. Cochrane Database Syst Rev. 2007 Apr 18;CD005051.
  21. Woodgate D, Chan CH, Conquer JA. Cholesterol-lowering ability of a phytostanol softgel supplement in adults with mild to moderate hypercholesterolemia. Lipids. 2006;41:127-132.
  22. Tapola NS, Lyyra ML, Kolehmainen RM, et al. Safety aspects and cholesterol-lowering efficacy of chitosan tablets. J Am Coll Nutr. 2008;27:22-30.
  23. Sood N, Baker WL, Coleman CI. Effect of glucomannan on plasma lipid and glucose concentrations, body weight, and blood pressure: systematic review and meta-analysis. Am J Clin Nutr. 2008;88:1167-1175.
  24. Wei ZH, Wang H, Chen XY, et al. Time- and dose-dependent effect of psyllium on serum lipids in mild-to-moderate hypercholesterolemia: a meta-analysis of controlled clinical trials. Eur J Clin Nutr. 2008 Nov 5.
... (more)

A comprehensive review combining the results of 14 studies found that glucomannan significantly reduced total and LDL cholesterol levels.289

Many studies indicate that water-soluble fiber supplements lower cholesterol.253,263,291 Keep in mind that the bulk of the supporting evidence for this theory comes from studies of oats conducted by manufacturers of oat products.255

Current evidence suggests that if chitosan does offer any benefits, they are minimal at best.84-92,147,148,187,197,225-226,285

... (more)

See the chitosan article and the glucommanan article for more information on these forms of fiber.

As for soluble fib fiber, you can incorporate more into your diet by taking supplements and/or increasing your intake of foods that are good sources of soluble fiber, such:

  • Oats and barley
  • Beans and peas
  • Nuts
  • Flax seeds
  • Fruits such as oranges and apples
  • Vegetables such as carrots

A typical dose of oat bran is 5 to 10 g with each meal and at bedtime; psyllium is taken at 10 g with each meal. For improving total and LDL cholesterol, studies have found benefit with beta-glucan at doses ranging from 3 to 15 grams daily. However, benefits have been seen more consistently at the higher end of this range, and one carefully designed study found no benefit at 3 grams daily.33

Beta-glucan products can contain molecules of various average lengths (molecular weight). Some manufacturers claim superior benefits with either high or low molecular weight versions. However, one study failed to find any difference between high molecular weight and low molecular weight beta-glucan for normalizing cholesterol and blood sugar levels.34

... (more)

Water-soluble fiber supplements (such as psyllium, hydroxymethylcellulose and its relatives, and beta glucan from oats) are thought to lower cholesterol, and the FDA has permitted products containing this form of fiber to carry a "heart-healthy" label.31 It must be kept in mind, however, that the bulk of the supporting evidence for this theory comes from studies of oats conducted by manufacturers of oat products.255

Glucomannan, a dietary fiber derived from the tubers of Amorphophallus konjac, has been shown to significantly reduce total and LDL cholesterol levels.

Chitosan, a type of insoluble fiber derived from crustacean shells, has been proposed for reducing cholesterol levels. Research is not yet very encouraging for using chitosan for this purpose.

... (more)

Experts believe that soluble fiber reduces cholesterol levels by increasing excretion of cholesterol from the digestive tract. This affects two forms of cholesterol: cholesterol from food, and, more importantly, cholesterol from the blood “recycled” by the liver through the intestines.

... (more)