'Cannot easily be improved' is a tough one. For a lot of people their weight and issues with food cannot easily be improved. I'm not sure that's a good definition of a disability. I don't believe that being overweight is a disability as such, but being very overweight can have all sorts of effects on the body which might qualify.
_________________The Official "Saucy Minx"

This above all: To Thine Own Self Be True
"Red sky at night, Shepherds Delight"..Which is a bit like Shepherds Pie, but with whipped topping instead of mashed potato.