Yes, whole oat products and  foods containing psyllium will lower cholesterol levels and reduce heart disease, says the American Council on Science and Health. In a new booklet that takes most of the health claims for functional foods to task, they also agree that soy foods and foods made with soy protein have shown the same health benefits. But the lobby group, which receives funding from some major food processors, disagreed that dark-green leafy vegetables containing lutein reduce risk of eyesight degeneration and that meats and dairy products containing conjugated linoleic acid deliver various health claims.