Have you ever noticed that the media are constantly reporting findings from yet another nutrition research study? Knowing which types of studies are the most reliable is helpful, according to Rachel Johnson, PhD, MPH, RD, who presented on this topic at an American Dietetic Association (ADA) meeting. IDEA author Cathy Leman, RD/LD, draws on the ADA session to explain the different types of research, from the most to least reliable.