This book is dedicated to the patients and professionals of the Oncology Sector of the Maria da Glória Outpatient Clinic of the Clinical Hospital of the Federal University of Triângulo Mineiro - UFTM, who were willing to contribute to the research. I would like to thank my family for their support, encouragement and trust during this journey. I hope that the science of nutrition and medicine work together in favour of progress in treatment and positive results.