Inulin vs. Psyllium: Which Fiber Is Best for Your Gut Health?
Inulin and psyllium are two types of soluble fiber that have benefits for digestive health. They have different health benefits, actions on the gut, and potential side effects.
How Inulin and Psyllium Compare
Inulin is a solible fiber containing prebiotics. Prebiotics are nutrients that feed the bacteria that live in the digestive tract (the gut microbiome).
Inulin is naturally present in some fruits, herbs, and vegetables. It is also available in supplement form, which is sourced from chicory root.
The stomach doesn't digest inulin. Helpful bacteria in the colon ferment inulin, creating byproducts beneficial to health.
Benefits of inulin include:
l Anti-tumor (cancer) effects, although evidence conflicts on the benefits for colorectal cancer
l Benefits for metabolic syndrome by improving blood sugar levels
l Improved immunity and support for asthma and allergic diseases
l Preventing type 2 diabetes, inflammatory bowel disease (IBD), chronic kidney disease, and some cancers
l Reducing blood pressure
Research includes:
l Weight loss: There's little research to support inulin for weight loss. In one study, people taking inulin supplements while restricting calories did not experience more weight loss than those taking a placebo (inactive treatment), but their blood pressure was lowered.
l IBD: There is some evidence that inulin may help in IBD. It can also cause bloating or diarrhea, so people with IBD should work with their healthcare team when considering supplements.
l Tumor growth: It's not understood why, but inulin may reduce the risk of tumor growth. The studies were done in labs and on mice. People with cancer should work with their healthcare team when considering inulin, and it should not replace treatment.
l Allergies: There is some evidence that inulin may affect the cells that lead to allergic diseases. Inulin may help treat or prevent food allergies and asthma. Inulin is also an allergen, though it is rare.
Foods that contain inulin include:
l Asparagus
l Artichokes
l Bananas
l Chicory roots
l Garlic
l Leeks
l Oats
l Onions
l Soybeans
l Wheat
What Does Psyllium Do?
Psyllium is a soluble fiber that comes from Plantago ovata, which is a tropical medicinal plant. Psyllium is added to the diet through supplements or to cereals and baked goods.
In the gut, soluble fiber mixes with water to form a gel-like substance. This gel makes stools softer and easier to pass, helping treat digestive conditions and improving gut health.
Psyllium also promotes the growth of beneficial bacteria in the gut.
Benefits of psyllium include:
l Lowering low-density lipoprotein cholesterol (LDL-C) levels: Psyllium supplements may help improve heart health by lowering cholesterol levels and reducing the risk of cardiovascular disease.
l Managing blood glucose levels: In one study, blood glucose levels improved when participants took psyllium supplements twice a day at mealtime.
l Managing the symptoms of irritable bowel syndrome (IBS): Several studies show that psyllium fiber supplements may be helpful for people coping with irritable bowel syndrome with constipation (IBS-C).
l Maintaining remission in ulcerative colitis: Trials of psyllium in ulcerative colitis show benefits for maintaining remission. Taking a psyllium supplement increases the level of butyric acid in the gut. Butyric acid may help in the treatment of ulcerative colitis.
l Reducing risk of colorectal cancer: A high-fiber diet reduces cancer risk. Taking psyllium consistently over a long period benefits gut health, which reduces colon cancer risk.
When Should You Choose Inulin vs. Psyllium Supplements?
Inulin is a prebiotic that supports the gut microbiome and overall digestive health. Psyllium helps with bowel regularity, certain digestive conditions, and reduces the risk of cardiovascular disease.
Combining inulin and psyllium provides broader support for gut health. People with digestive conditions should consult a healthcare provider about adding fiber to their diet.
What Are the Potential Side Effects and Precautions for Each?
The most common adverse effects of adding a fiber supplement to the diet are bloating, stomach pain, or stomach cramps. Gradually increasing fiber may help reduce these side effects.
Precautions and side effects include:
l Inulin: Some people with IBS experience bloating after eating foods containing inulin or taking inulin supplements. In one small study, people with IBS who took inulin and psyllium fiber together had less intestinal gas.
l Psyllium: Impaction (blockage) in the esophagus has occurred in people taking bulk psyllium laxatives.Allergic reactions are rare but are also possible.
Key Takeaways
l Both inulin and psyllium are forms of soluble fiber that have gut health benefits.
l Inulin is a fermentable fiber found in foods and supplements, and psyllium is a non-fermented fiber supplement.
l Digestive symptoms may occur when adding fiber to the diet, so it's essential to work with a healthcare provider and introduce fiber gradually.
