In 1998, Dr. Natasha Campbell-McBride opened the Cambridge Nutrition Clinic. As a parent of a child who has fully recovered from a serious learning disability problem, she was well aware of the difficulties faced by other parents like her, and she devoted much of her time to helping these families. She realized that food plays a crucial role in helping children and adults overcome these disorders, and was a pioneer (innovator) of the use of probiotics in this area. Her willingness to share her knowledge was manifested both in contributing to the publication of many works and in participating in numerous international seminars and conferences on the problems of teaching learning difficulties and digestive disorders. This book contains all her experience and knowledge, including her most recent work. She believes the link between physical and mental health, the food and drink we accept, the state of our digestive system is absolute.