Gastrointestinal diseases profoundly affect a person's well being. When the GI system fails, nutritional status suffers and the person is unable to support a healthy immune system, making him or her more vulnerable to illness and infection. This comprehensive guide takes an in depth look at the role the gastrointestinal tract plays in maintaining life and health. The author provides a helpful overview of how the GI tract works and the types of problems that can arise. She also explores the new research into the causes and treatment of the diseases, with special emphasis on nutrition regimens.