Why Fiber Matters
Psyllium Husk, Gut Health, and Cholesterol
The short version
- Psyllium husk supports regular, predictable poops.
- It also supports healthy cholesterol levels and a steadier blood-sugar response
- Other fibers feed gut microbes that produce helpful compounds called short-chain fatty acids
- Across large studies, higher fiber intake is consistently linked with improved gut microbiome diversity and better long-term health outcomes
The basics of soluble and insoluble fiber
The two types of fiber you've probably heard of are soluble and insoluble.
Soluble fiber mixes with water. Psyllium husk is a soluble fiber that absorbs water and swells into a soft gel.
Many other soluble fibers are broken down (fermented) by the microbes in your gut, producing healthful compounds.
Insoluble fiber doesn't dissolve in water. It generally stays more intact, adds bulk, and helps move things through your digestive system.
These labels are a useful starting point, but they don't tell the whole story. Different soluble fibers can behave very differently once you eat them. Psyllium husk’s biggest impact comes from the the gel it forms.[2]
What psyllium husk does
Psyllium husk, the main fiber in Cour, can absorb over 10x its weight in water, forming a gel. This gel drives most of psyllium husk's health benefits.
Better, more predictable poops
The gel psyllium husk forms in your gut can soften hard poops, give loose poops more shape and improve your poop game. You'll need to come up with some craft projects for the TP you won't need ;)
In guidelines from the American Gastroenterological Association and American College of Gastroenterology, psyllium was the only fiber supplement studied that clearly appeared effective for chronic constipation.[3] (PMC)
Healthy cholesterol support
Your liver uses cholesterol to make bile, a fluid that helps your body digest fat.
Once bile has done its job, your body normally absorbs most of it and sends it back to the liver to be used again.
But psyllium husk’s gel can absorb bile so your body can't reuse it (this is good). Your liver then makes replacement bile by pulling cholesterol out of your blood stream.
In plain English: Psyllium husk helps you poop your cholesterol levels down!
A review of 28 clinical trials found that around 10 grams of psyllium husk per day lowered LDL—the cholesterol often called “bad” cholesterol—by an average of about 13 mg/dL.[4] (PubMed). One serving of Cour has 9g of psyllium husk.
Steadier blood-sugar response
When you eat carbohydrates, your body breaks them down into glucose (sugar) that enters your bloodstream. Large spikes in glucose from foods high in simple carbs can increase inflammation in the body, contributing to disease over time.
Psyllium husk’s gel can slow that process, allowing sugar to enter the blood more gradually instead of all at once.
A 2024 review of 19 clinical trials found that psyllium husk improved fasting blood sugar, long-term blood-sugar levels and insulin resistance.[5] (PubMed)
Other fibers feed your gut microbes
Psyllium husk works mainly by absorbing water and forming a gel. It is not heavily fermented by the microbes in your gut.
Other fibers are much more fermentable. When your gut microbes eat these fibers, they produce useful compounds called short-chain fatty acids, or SCFAs.
One of the most important SCFAs is called butyrate.
Why short-chain fatty acids (SFCA) matter
SCFAs help connect what you eat with the health of your gut.
They help protect the gut barrier. Your gut lining works like a carefully controlled border. It lets nutrients into your bloodstream while helping keep bacteria and other unwanted material inside your digestive system. Butyrate helps power the cells that maintain this barrier and supports the proteins that seal those cells together. When this barrier breaks down and things are sneaking past it into your body, people sometimes call it "leaky gut".
They help regulate inflammation. Inflammation is part of your body’s normal defense system, but it needs to turn on and off at the right times. SCFAs communicate with immune cells and help influence the signals that control inflammation.
The process looks like this:
Certain fibers feed gut microbes → the microbes produce SCFAs → SCFAs nourish the colon, support the gut barrier and help regulate inflammation.[6] (PubMed)
What about insoluble fiber?
Insoluble fiber stays mostly intact as it moves through your digestive system. It adds bulk and helps move things along.
You can find it in foods including whole grains, veggies, nuts, and the skins of many fruits.
For the broadest benefits, a healthy diet should include a variety of fibers that work in different ways.
The bigger health picture
Scientists have studied fiber in connection with tons of diseases.
Most of this research looked at total fiber intake across a person’s overall diet. These studies show strong links, but don't prove fiber alone caused the difference.
Here is what major studies have found:
- Heart disease: Every additional 7 grams of fiber per day was associated with about a 9% lower risk of cardiovascular and coronary heart disease.[7] (BMJ)
- Stroke: Every additional 7 grams per day was associated with a 7% lower risk of a first stroke.[8] (PubMed)
- Type 2 diabetes: People eating the most fiber had a 19% lower associated risk than those eating the least.[9] (PubMed)
- Colorectal cancer: Every additional 10 grams of fiber per day was associated with about a 10% lower risk.[10] (BMJ)
- Breast cancer: Women eating the most fiber had an 8% lower associated risk than women eating the least.[11] (ACS Journals)
- Brain health: In a study of more than 41,000 adults, higher fiber intake was associated with a lower risk of disabling dementia. Compared with the lowest-fiber group, the highest-fiber group had an associated risk that was 18% lower among women and 14% lower among men. Research in this area is newer and less settled than the evidence around digestive and heart health.[12] (PubMed)
- Longevity: Every additional 10 grams of fiber per day was associated with an 11% lower risk of death from any cause during the study periods.[13] (PubMed)
One of the largest reviews of fiber research combined 185 long-term studies and 58 clinical trials. It found consistently better health outcomes among people who ate the most fiber, with the greatest overall benefits appearing around 25 to 29 grams per day.[14] (PubMed)
No single food or supplement guarantees protection from disease. But study after study points in the same direction:
Eating enough fiber is a seriously good idea.
Where Cour fits
The goal is not to pick one type of fiber and declare victory.
Beans, vegetables, fruit, whole grains, nuts and seeds all bring different fibers and nutrients to the table. Variety matters.
Cour makes one part easy: each serving delivers 10 grams of fiber from organic psyllium husk and real organic fruit. No sweeteners. No fillers. No weird stuff.
Cour does not replace a plant-rich diet. It helps close the gap between the amount of fiber you mean to eat and the amount you actually eat, and gives you a proper dose of psyllium husk's clinically studied gel forming fiber. It's one big step in the right direction, every day.
Glorious poops are just the beginning.
Scientific references
- U.S. Food and Drug Administration. Daily Value on the Nutrition and Supplement Facts Labels.
- McRorie JW Jr, McKeown NM. Understanding the Physics of Functional Fibers in the Gastrointestinal Tract. Journal of the Academy of Nutrition and Dietetics. 2017.
- Chang L, et al. American Gastroenterological Association–American College of Gastroenterology Clinical Practice Guideline: Pharmacological Management of Chronic Idiopathic Constipation. Gastroenterology. 2023.
- Jovanovski E, et al. Effect of Psyllium Fiber on LDL Cholesterol and Alternative Lipid Targets. American Journal of Clinical Nutrition. 2018.
- Gholami Z, Clark CCT, Paknahad Z. The Effect of Psyllium on Fasting Blood Sugar, HbA1c, HOMA-IR and Insulin Control. BMC Endocrine Disorders. 2024.
- Liu P, et al. The Role of Short-Chain Fatty Acids in Intestinal Barrier Function, Inflammation, Oxidative Stress and Colonic Carcinogenesis. Pharmacological Research. 2021.
- Threapleton DE, et al. Dietary Fibre Intake and Risk of Cardiovascular Disease. BMJ. 2013.
- Threapleton DE, et al. Dietary Fiber Intake and Risk of First Stroke. Stroke. 2013.
- Yao B, et al. Dietary Fiber Intake and Risk of Type 2 Diabetes. European Journal of Epidemiology. 2014.
- Aune D, et al. Dietary Fibre, Whole Grains and Risk of Colorectal Cancer. BMJ. 2011.
- Farvid MS, et al. Fiber Consumption and Breast Cancer Incidence. Cancer. 2020.
- Aoki S, et al. The Dietary Fiber Intake and the Risk of Disabling Dementia. Journal of Atherosclerosis and Thrombosis. 2026.
- Kim Y, Je Y. Dietary Fiber Intake and Total Mortality. American Journal of Epidemiology. 2014.
- Reynolds A, et al. Carbohydrate Quality and Human Health: A Series of Systematic Reviews and Meta-Analyses. The Lancet. 2019.
This page discusses research on dietary fiber generally. The cited studies do not establish that Cour diagnoses, treats, cures or prevents any disease.