This book chapter delves into the critical role of functional foods in preventing and managing chronic diseases. It provides a comprehensive overview of chronic diseases and the multifaceted factors contributing to their prevalence. The chapter elucidates the significance of bioactive compounds and essential nutrients in functional foods, focusing on their potential to enhance overall health and well-being. Subsequently, it delves into specific categories of chronic diseases, illustrating how functional foods can be applied effectively for cardiovascular disease prevention, diabetes management, cancer risk reduction, dyslipidemia, obesity control, non-alcoholic fatty liver disease prevention, and chronic kidney disease management. In conclusion, it underscores the pivotal role of functional foods in combating chronic diseases and fostering a healthier future.