This lecture will feature some of the latest nutrition science information, starting with some of the basic facts and principles around nutrition and dietary behaviours, the links between inadequate nutrition and chronic diseases, the benefits of dietary supplementation, the importance of bioavailability of active ingredients, and why certain polysaccharides are crucial for health. Dr. Lewis will discuss the results of his extensive line of research on how polysaccharides modulate the immune system and other organ systems in the context of patients with Alzheimers, HIV, MS, non-alcoholic fatty liver disease, and healthy adults. Having a proper understanding of the evidence base of nutrition and dietary supplementation and their relationships to chronic disease is important for all allied health practitioners and wellness industry professionals, especially considering all of the marketing hype around diet, food, and dietary supplements. Dr. Lewis lecture provides attendees an evidence-based review of nutrition science that emphasizes some recent important findings that have an impact on health and quality of life.