There are two types of fiber: soluble and insoluble. Soluble fiber dissolves in water and forms a gel-like substance that slows down digestion. It can help lower cholesterol and regulate blood ...

Salt is soluble in water too. Substances that do not dissolve in water are called insoluble substances. When you mix sand or flour with water, they do not dissolve.

But what's the difference between soluble and insoluble fiber ... of dietary fiber that dissolves in water to form a gel-like substance," says Lauren Manaker, MS, RDN. "This quality allows ...