"A good source of fiber." Sound familiar? You've likely seen this sentence on everything from boxed cereals to a container of yogurt. But do fiber-fortified foods (that is, foods that have synthetic fiber specifically added to them) really improve your health? It's a little unclear. 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.