By Rhiannon Ross | rhiannon.ross@examiner.net Blueberries instead of cheesecake, green tea instead of soda pop and broccoli instead of french fries? These are just a few food substitutes cardiologist and medical professor James O'Keefe, M.D., recommends people make to their diets. Is he nuts? "Nuts make a good substitute for candy," he adds. He and his wife, Joan O'Keefe, a registered dietitian, are authors of The Forever Young Diet and Lifestyle (www.foreveryoungdiet.com). The book offers "a commonsense plan that improves satiety; promotes wholesome, fresh, and easily obtained foods; and reinforces a rational, holistic, mind-body approach to diet and lifestyle." Key...