Psyllium Fiber Vs. Methylcellulose

Oats are a source of methylcellulose, an indigestible fiber
Oats are a source of methylcellulose, an indigestible fiber (Image: oat image by nirbo from <a href=''></a>)

A high fiber diet prevents constipation and diverticular disease, and it reduces risk of cardiovascular disease and Type 2 diabetes. Vegetables, fruit and grain are healthy sources for dietary fiber, but many people also take fiber supplements to make sure they consume enough fiber on a daily basis. Choosing the right fiber can be confusing, as there are many on the market.


Dietary fiber sometimes isn't a fiber at all. It is the indigestible component of food. Fiber is categorized according to its action in the large intestine: viscous, soluble or fermentable. Viscous fibers dissolve in water to form a gel that provides bulk for stool in the colon. Soluble fibers dissolve in water, and they absorb water in the colon, also creating bulk. Some fibers ferment in the colon, providing food for healthy intestinal bacteria. More healthy bacteria means a better functioning colon.


Psyllium is made from the husks of psyllium seeds. It is soluble and viscous, forming a gel when it absorbs water, and it ferments in the colon, feeding healthy intestinal bacteria. Psyllium slows the passage of food through the stomach and intestines, and slows absorption of nutrients from food. It helps lower cholesterol, and normalizes blood glucose and insulin. This helps to prevent Type 2 diabetes. Psyllium makes stool softer and bulkier, preventing constipation. It's also used to treat irritable bowel syndrome and diverticular disease.


Methylcellulose is found in the cell walls of plants, such as oat bran. Methylcellulose is soluble, so it absorbs water in the colon and provides bulk and softness, making stool easier to pass. It isn't viscous, and it doesn't ferment in the colon. Methylcellulose is inert in the intestines, passing through without being digested and absorbed. It is used to treat constipation, irritable bowel syndrome and diverticular disease, but because of its water-absorbing property it is also used sometimes to treat diarrhea.


Psyllium is the main ingredient in Metamucil and Konsyl. Methylcellulose is the main ingredient in Citrucel. However, these ingredients can also be found in health food stores in bulk. If you want to take psyllium, you can find it in many forms in the health food store. The least expensive psyllium products are found in the bulk products aisle. Methylcellulose is found in the walls of plant cells. Oat bran is a good source, and is readily available at health food stores and many grocery stores.

Recommended Fiber Intake

For adults younger than 50 years of age, the recommended total fiber intake is 38 grams a day for men, and 25 grams a day for men. This includes dietary fiber and supplements. For adults older than 50 years of age, the recommended intake is 30 grams a day for men and 21 grams a day for women from all sources.

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