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  It is understandable that you have concerns for your mother. Although your mother might experience constant hunger as a result of her memory loss and brain dysfunction that may hinder her ability to remember whether she ate or not and has disrupted her hunger patterns. It is important to have her evaluated by a physician, as there could be other factors that are contributing to her constant hunger and low weight. Some of these conditions may be reversible and may or may not be related to Alzheimer's disease. Some individuals who are classified as underweight do not have any nutritional deficiencies or other health concerns, whereas others may have underlying issues that require close medical attention. Besides first bringing your mother to her physician, also consider consulting with a nutritionist or dietician if your mother is otherwise healthy in order to address specialized nutritional needs.