Soluble viscous fibre dissolves in water and forms a gel-like material in the digestive tract that helps lower cholesterol and maintain healthy blood sugar levels as part of your diet. Sources include oats, barley, fruits, legumes (beans and peas), and psyllium.
Insoluble fibre does not dissolve in water. Insoluble fibre can add bulk to the stool. Sources include wheat bran, whole grain cereals and breads, and many vegetables.
Most plant-based foods contain both types in varying amounts. For a good health, it’s best to eat a wide variety of high-fibre foods.