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Dietary fibers are carbohydrates that the human digestive system does not break down. They are divided into soluble and insoluble fibers, each group performing different functions in the digestive tract. The European Food Safety Authority (EFSA) recommends adults consume at least 25 g of dietary fiber per day, but the average intake among Lithuanians does not meet this standard.
Soluble fibers dissolve in water and form a viscous gel-like mass. This property slows down the movement of food through the digestive tract, helps stabilize blood glucose levels after meals, and contributes to lowering cholesterol. The main sources of soluble fibers in supplements are plantago ovata (psyllium) husks, inulin, beta-glucan, and guar gum.
Insoluble fibers do not dissolve in water and pass through the digestive tract almost unchanged. They increase stool bulk, stimulate intestinal peristalsis, and help maintain regular bowel movements. Natural sources include wheat bran, cellulose, and vegetable fibers.
Most dietary fiber supplements are based on soluble fibers because they are easier to consume (dissolve in water or come in capsules) and have a broader scientific research base for improving specific health indicators.
Psyllium (plantago ovata) husks consist of about 70% soluble and 30% insoluble fibers. The soluble part forms a viscous gel in water that maintains its structure throughout the digestive tract because it is not fermented by gut bacteria. Due to this property, psyllium acts in two ways: it softens hard content in constipation and thickens liquid content in diarrhea.
EFSA has approved several health claims related to psyllium: psyllium fibers contribute to maintaining normal blood cholesterol levels (when consuming 10 g per day), and plantago ovata seed husks contribute to maintaining normal bowel function.
Clinical studies also show that psyllium can reduce abdominal pain associated with irritable bowel syndrome (IBS) and help control blood glucose levels after meals in patients with type 2 diabetes.
Inulin is a soluble, fermentable fiber most commonly obtained from the root of chicory. Unlike psyllium, inulin is fully fermented by gut bacteria and acts as a prebiotic substrate: it promotes the growth of beneficial Bifidobacterium and Lactobacillus bacteria in the colon microbiota.<
Inulin does not form a viscous gel and therefore does not have the same cholesterol-lowering or glucose-stabilizing effects as psyllium. Its main function is to support the gut microbiome. EFSA-approved claims state that natural chicory inulin fibers contribute to normal bowel function when consuming at least 12 g per day.
When choosing between psyllium and inulin, it is important to consider the goal: psyllium is more suitable for cholesterol control and regular bowel movements, while inulin is better for strengthening the gut microbiome. Both supplements can be found in the supplements category.
Powders are the most economical and flexible form. Psyllium powders are mixed with 200–300 ml of water and consumed immediately, as the gel forms within minutes. Inulin powders dissolve without odor or taste, making them easy to add to smoothies, yogurt, or porridge.
Capsules are suitable for those who do not want to feel the texture or taste of fibers. However, one capsule usually contains only 0.5–1 g of fiber, so several capsules are needed to reach the recommended dose at once.
Chewable tablets and fiber gummies are supplemented with fiber sources but usually have smaller doses and may contain added sugar. This form is more suitable as an additional source rather than the main fiber dosing method.
EFSA recommends at least 25 g of dietary fiber per day for adults. If the daily diet does not provide this amount, supplements can help achieve the recommended intake. The dose should be increased gradually to allow the digestive system to adapt.
Soluble fibers dissolve in water and form a gel that slows digestion, stabilizes glucose, and lowers cholesterol. Insoluble fibers increase stool bulk and stimulate intestinal peristalsis. For optimal effect, it is recommended to consume both types of fibers.
Do psyllium fibers help with constipation?
Yes. Psyllium forms a viscous gel that retains water and softens intestinal content. Unlike stimulant laxatives, psyllium works mechanically and is suitable for long-term use. It is important to take it with sufficient water (at least 200 ml).
Viscous, gel-forming soluble fibers (psyllium, beta-glucan) have EFSA-approved claims for cholesterol reduction. Psyllium fibers contribute to maintaining normal cholesterol levels when consuming 10 g per day with main meals.
Fiber supplements, especially psyllium, are recommended to be taken at least 1–2 hours before or after medications. The viscous gel can slow the absorption of some drugs. It is advisable to consult a doctor before starting fiber supplements with prescription medications.
Soluble fibers (especially psyllium) increase satiety and slow gastric emptying, which may help reduce overall calorie intake. However, fibers themselves do not cause weight loss: they are an auxiliary tool working together with a balanced diet and physical activity.
