Supplemental Fiber Is HealthyTRUE: Foods with added fiber don't necessarily provide the benefits you might expect. Inulin, for example, a soluble fiber extracted from chicory root, can be found in products like Fiber One bars. In addition to boosting fiber content, it's also commonly used to replace fat. Inulin is known as a prebiotic, which means it promotes the growth of healthy bacteria in your gut. That's good, of course. "But," says Slavin, "inulin doesn't have the same cholesterol-lowering effect as the fiber found in oat bran."
Food Companies Are Jumping on the Fiber BandwagonDUH: In 2007, the FDA declared that polydextrose can be called fiber. Poly-what? Polydextrose is made from glucose, sorbitol (a sugar alcohol), and citric acid. It's what puts the fiber in Fruity Pebbles (not actual pebbles). Polydextrose received FDA approval because it mimics some attributes of dietary fiber: It isn't absorbed in the small intestine, and it increases stool weight. Polydextrose mainly bulks up foods so they're not as high in calories. However, there's no research to prove that polydextrose is as beneficial as the fiber found in whole foods. Discover 11 other secrets the food industry doesn't want you to know.
Fiber Helps Prevent Colon CancerMAYBE: This idea arose in the 1960s when it was noted that fiber-scarfing Ugandans rarely developed colon cancer. But nearly five decades later, it still hasn't been proven.
In 1999, Harvard researchers found no link between dietary fiber intake and colon cancer. But a European study that tracked more than a half million people correlated a high-fiber diet with up to a 40 percent reduced risk of colorectal cancer. Then a 2005 review in the Journal of the American Medical Association found that people who ate the same amount of fiber as those in the European study didn't experience any benefit. The American Institute for Cancer Research calls protection "probable." This controversy aside, high-fiber diets are associated with preventing many chronic diseases, so it's smart to boost your intake, says Arthur Schatzkin, M.D., Dr.P.H., of the National Cancer Institute. Prevent disease and add years to your life with these secret age erasers.