Lately my mom, 102 years old, has started to sleep through meals and refuse medication and even having her teeth put in. Around noon she wakes up a bit and eats maybe some soup or a pudding. This has been going on for over a week. How long can the body last on such little sustenance? I worry if I miss a day that will be the day she goes. I feel guilt but I am tired and stressed at seeing her sitting in her wheelchair and just sleeping and drooling. Does anyone know how much the body can last without proper nourishment?