Dave Boot emailed to provide a datapoint to complement my post a couple of months ago (dammit where's my permalinks when I need them?). Quoth Dave:
One out of three US people is heavier than the other two combinedwhich I rather like as a statistic.
At first it sounded nonsensical to me, but I guess it means that the heaviest third of America's population weighs more than the other two thirds. Amazing! Could this be true?