Alzheimer’s disease does not eat and drink for the following reasons: First, Alzheimer’s disease does not eat and drink indicates a change in condition, probably because the lung infection aggravates the patient’s poor spirit, does not want to eat, does not drink symptoms, it is recommended that patients go to the regular hospital as soon as possible to improve blood routine, chest CT, liver and kidney function and other tests, and at the same time need to insert a gastric tube nasal feeding diet to help patients through the stage of not eating. Secondly, Alzheimer’s disease does not eat, does not drink water, may be the patient into advanced dementia, many patients with advanced dementia are unable to eat on their own, drink water that choking situation, patients with advanced dementia need nasal feeding diet, if forced to eat, drink water will appear lung infection.