Kiwi Farms

I do like to watch tv-shows about fat people, because fat people are hilarious even when not a lolcow. I tried googling it, but didn't find anything.
What would happen if the loved one, the carer. Would be so sick of their shit, that they just leave. So the obese person ends up completely alone. Immobile and they are probably going to starve to death, but the question is if this would have any legal consequences? Sure, you get thrown in jail for leaving your kid on a few months for too long. But even if you are obese, you are an adult and are functional in the head.
Do they have a contract that keeps them there?