Mysterious death

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Can anyone here help me understand the death of my grandfather? His legs fell asleep on the toilet, he fell down and injured his spine. He spent a couple months recovering from it while stationary. But as time went on, he became emaciated, like an Ethiopian child, and then had a heart attack and died.
It just doesn't make sense to me that a bone fracture would cause someone to just starve away like that and die so quickly.
My family just assumed "that's what happens to old people lmao." I have one theory that my mentally declining grandmother failed to properly feed him during his recovery and he gradually died of malnutrition.
Can anyone offer up an explanation for how a person could die like that after a simple spinal injury?
>inb4 "OP is in denial and refusing to accept a death in the family"
He died a year ago, I'm emotionally fine. I'm just bewildered by the physiology involved.