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Bulimia nervosa is an eating disorder that involves incidences of overeating (bingeing) and subsequent purging through self-induced vomiting and the use of laxatives and diuretics. Other purging behaviors may include fasting and vigorous exercise, prompting comparisons to anorexia nervosa. While some behaviors and thought processes may be consistent among both bulimia and anorexia, such as an obsession with body image and shape, the psychology of the sufferers is markedly different. According to the National Center for Biotechnology Information (NCBI), anorexic individuals hold themselves in high esteem for their food deprivation practices; bulimic individuals carry out their behaviors under the weight of extreme shame and guilt.