Reason #4: That Itch

There is no minor agony more tortuous than that itch in the middle of your back that's juuuuust out of reach. If you're hugely overweight, you not only have a greater acreage of back skin that's prone to itching, you're also less likely to be lithe and limber enough to be able to get to that maddening itch and dispatch it. You could, I suppose, procure one of those hand-on-a-stick backscratchers, but doing is all but admitting that your fat has won the war. Might as well tie a white flag to the end of the thing.