I knew a very obese woman, one of the nicest people you would ever know. She was never on disability but due to her weight, her knees gave out and she was in a wheel chair. Her weight ruined her body in that sense. Some in some ways, she could go on disability ... of course, she went in for knee surgery, it was completely covered in cancer and she was dead about a year later.
This is what we are concerned about with this friend. He isn't very mobile and has horrible fluid retention in his legs and since he has no medical coverage who knows how bad it really is.