While The Astral Self's Away, The Body Can't Play

What happens to a person's body while they're remote projecting? I mean sure, it sits there, but will it starve to death if they're away too long? Can they program there body to do respond in a certain way to a given situation? Could a magician leave it with a command to get up and fix a sandwich when it receives that particular set of impulses from the brain indicating hunger?

It might be more relevant to make the body able to protect itself in the event of danger. An fire, for example. It won't be fun to return to your body only to find it's a charred husk because you didn't clean the lint drawer before starting a load of laundry. Or would the part of the person that's being projected notice something like that? Tyson said he didn't even realize his remote self could feel pain when Strange blasted it, so would he have perceived something his physical form was experiencing? Remote projecting seems like a low-rent astral projection, and Strange was concerned about not being away from his body too long, because his astral self would dissipate, I guess. I can't remember Strange necessarily being aware of threats against his physical self, unless the villain was feeling chatty.

One other thing. While the astral self is away, what's the risk of possession by outside forces? The body isn't dead, but it's empty. I suppose one could set up wards for that sort of thing, but a determined enough force could get past those, or a patient one could wait for them to dropped. I assume the mage would have to drop the wards to get back into their body, if they set them up to prevent beings from setting up shop.