Clinical nutrition is the study of the connection between your body’s overall state of wellness and the foods you eat each day. If you go beyond the details of how diet affects health — how particular nutrients can produce particular health outcomes or what kind of diet most effectively helps you reduce your risk of developing diseases like diabetes, heart diseases, hypertension, and so on — you realize that what you eat really matters. This cheat sheet identifies the diseases that wise dietary decisions can help you avoid, explains what researchers say about common dietary supplements, and introduces you to health behavior terms all clinical nutritionist should know.