It is generally believed that people with high-fiber diets have lower rates of heart disease. But according to John Swartzberg, a professor of public health at University of California, Berkeley, no one really knows why fiber-rich foods appear to prevent heart disease. It might be the fiber itself or something else entirely.
So why put fiber in at all? Because people are likely to choose junk food over fruits and vegetables, according to some food scientists, so you might as well put fiber in those products, even if the benefits are unclear.
Read More: Is Adding Fiber To Food Really Good For Your Health? | NPR