There are many reasons why the elderly do not eat and drink only water, there may be reduced digestive function, suffering from digestive disorders, psychological disorders and so on. 1. Decreased digestive function: with age, the elderly gastrointestinal peristalsis slows down, the problem of decreased digestive function, there will also be reluctant to eat. 2. Suffering from digestive system diseases: When the elderly have a significant loss of appetite and lose weight, it is necessary to undergo gastroenteroscopy to determine whether there are malignant tumors in the gastrointestinal tract. 3. Psychological disease: when the elderly long-term mental anxiety or depression, it will also lead to the eating center is affected, thus appearing the problem of low appetite. When the elderly long-term do not eat, only drink water may also be caused by other reasons, it is recommended that family members take the elderly to the hospital in a timely manner, to clarify the cause of the disease and follow the doctor’s instructions for treatment.