We also know things not to do; it's a bad idea to eat a lot of junk food, such as chips, ice cream, candy, donuts, donuts, and other foods with sugar or fat. It's a bad idea to be a couch potato-a person who watchee a lot of TV anf doesn't exercise. It's a terrible idea to smove. But scientists now have new information about other ways to stay healthy. Some of it is surprising