In all geriatric patients with dementia it was prove a weight loss independently if they are institutionalized or not.There are some previous studies that indicates the effect of the megestrol acetate in the weight gain of patients with cachexia-anorexia related with neoplasia. It seems that the mechanism of development could be the same between these patients and patients with dementia. It was described an important role of a group of cytokines ( Il-6, leptin, neuropeptide Y, TNFalfa) in the development of this nutritional alteration.