Book excerpt: A practical reference and teaching book of case studies for nutrition practitioners and other healthcare professionals, demonstrating how to apply the latest evidence-informed principles of personalized nutrition. Covering a range of complex cases such as autoimmunity and inflammation, hormonal disruption, mental health concerns and more, this edited collection explains the most recent developments in nutrition science and how these can inform patient management. Complete with in-depth case histories, Q&As with the practitioner and explaining the clinical reasoning behind decisions, this is the most comprehensive guide to help put theoretical knowledge of personalized nutrition into practice.