People with dementia just... forget how to eat one day. They forget how to swallow.
We don't know if they feel starvation or pain, because they're too far gone.
My brother works in a dementia care facility, and they know that a patient is gonna die soon when they eventually refuse food.
And we don't euthanise them. They just... starve. To death. And they never tell the families that.
Edit: I'm *so* sorry to those that have lost loved ones to dementia. It's a really cruel and heartless way to die.