Book excerpt: Functional food sources are growing in popularity because they are exceptionally nutritious and provide amazing medical advantages. They can help ensure against infection, prevent supplement deficiency, and advance appropriate health development and improvement. With illustrative case studies, this new volume explores the many roles of functional foods in the prevention and management of various diseases, including diabetes, autism spectrum disorder, weight loss and obesity, microbial infections, ulcers and other gastrointestinal diseases, mental disorders and brain health, cardiac health and cardiovascular diseases, osteoporosis and bone health, and more.