In the almost 2 years since my mother died every single time I call my dad and tell him im coming over or im going to the store he asks for something ,, then he asks for things after I already bring him things. Yesterday when I asked if he wanted me to bring something he said "no". that's a first .. and he seems to have quit eating much at all. Even his orange juice or milk he doesn't seem to care about. Im beginning to think this is coming to a swift end. The nurse that saw him on Tuesday night mentioned Hospice in passing ie. "Well they wont call in hospice unless he loses significant weight but hes the kind of guy that's going to find food anyway he can". I thought that was an odd statement. Is he saying that because of the cost? because hospice care is covered and this private in home care is out of pocket? was he saying it because he doesn't think my dad has much time? We were talking about costs of care givers so maybe it was the expense issue. Im not sure, wish I had been able to put it together at the time and ask why he mentioned hospice. but all in all, i'm watching my dad shut out the world,, basically just shut down period.
At a certain point, it's risky to leave them alone at all, especially, with electric appliances. It sound like your dad has supervision. That's good. (They often will also lose the ability to use a remote control, phone, thermostat control, etc.
I'd also read about how things may likely progress. Eventually, most people who have dementia will develop problems with walking, talking, toileting themselves, chewing and swallowing. Not all, but, many will develop these issues.
I'm so sorry it's happening to your dad. You are doing the right thing by getting support from others though. Knowledge is power and it can help you and your dad.
With people who have dementia, they may forget from hour to hour what food or beverages they have in the fridge or what they have consumed. Usually, their caretaker puts the food and beverage in front of them and it's then that they remember food. They often don't realize that there is food behind closed doors of cupboards or underneath a covered bowl.
His doctor should be able to answer your questions about Hospice. As well as eating issues. Sometimes, the person is nearing the end of life and even if they do eat, their body is not able to process the nutrients. Perhaps, others here can explain better than I can.