When monitoring principles of nutrition for children with mental health problems who study in specialized institutions of the Russian Federation or live in boarding schools, it has been revealed that there is no special adapted diet for them. According to the World Health Organization (WHO), unbalanced diets along with lifestyle habits are the main risk factors for chronic diseases, which can develop together with disorders in intellectual and cognitive abilities. Our objective was to study reference data for identifying and summarizing the nutritional characteristics typical for children requiring special medical care. The review has presented data of foreign and national authors, as well as data obtained with the “Arktika” Research Scientific Center of the Far Eastern Branch of the Russian Academy of Sciences, on the elemental status observed in children with autism spectrum disorders, and the nutritional characteristics of the diet kept by residents of Magadan Region under conditions of the Far North. Based on the data, we have made some recommendations for optimizing diet for children with mental disorders.