My grandfather has Alzheimer's disease. He refused to eat and occasionally drank water. His organs failed and his lactic acid exceeded the standard. The doctor suggested eating animal protein.
Alzheimer's disease has reached the stage you mentioned, and various organs are failing. It won't be long before you eat protein powder. The old man in our family has died of Alzheimer's disease for about 9 years. Finally, I can't eat, suffocate, and have nervous failure. He won't last long by hanging water. Taking care of Alzheimer's patients is really painful.