Fiber keeps you full, but when it comes to looking at cereal labels, you’re better off seeking out whole grains. “Fiber is in general good, but all fibers are not created equal,” says Liebman. “Intact fibers that come from whole grains or bran carry health benefits, but many cereals add in isolated fibers, which are removed from grains and made into powders.”
These fibers, which can include oat fiber, soy fiber, corn fiber, etc., have no proven health benefits. “They may have absolutely no benefit for you. We just don’t know,” says Liebman. “Having any sort of fiber as an ingredient just gives companies a chance to boast.”
Liebman recommends ignoring the fiber claims and looking only for cereals with whole grains and low sugar.