Personalized nutrition has a significant impact on mental health. Nutrition plans that are created by considering the genetic structure, environmental factors, and lifestyles of individuals can be an important tool in achieving psychological balance. Food affects not only the body but also the mental health, and proper nutrition can support emotional and psychological well-being. Therefore, personalized nutrition strategies are becoming increasingly important in mental health management. If the relationship between nutrition and mental health is better understood, treatment of mental disorders may be more possible. It is known that tailoring nutrition to individual needs has a positive impact not only on physical health but also on mental health. In this section of the book, research data that will provide a better understanding of the relationship between nutrition and mental health will be presented.