This book provides up-to-date information on lesser known eating disorders (EDs) and eating related disorders. EDs and eating-related disorders include a highly heterogeneous group of syndromes and symptoms characterized by abnormal eating and weight control behaviors that can appear in all genders and ages. EDs can lead to high rates of morbidity and mortality, especially if they are misdiagnosed and untreated.  The risk of underestimation is high for the lesser-known ED, and when unhealthy eating behaviors appear in unusual situations, such as some medical and psychiatric pathologies, adults and the elderly, sexual minorities etc. The volume examines EDs in specific populations (the elderly, males, infants and toddlers, sexual minorities, etc.).