what is soluble fibre
Instead, it passes relatively intact through your stomach, small intestine and colon and out of your body. Fiber is commonly classified as soluble, which dissolves in water, or insoluble, which doesn't dissolve. 1  Soluble fiber. 2  This type of fiber dissolves in water to form a gel-like material.3  It can help lower blood cholesterol and glucose levels.nstead, it passes relatively intact through your stomach, small intestine and colon and out of your body. Fiber is commonly classified as soluble, which dissolves in water, or insoluble, which doesn't dissolve. 1  Soluble fiber. 2  This type of fiber dissolves in water to form a gel-like material.