I did a piece on obese people a decade or two ago. Almost without exception, the overweight people claim that it's hereditary or "glandular". Some even go so far to avoid responsibility that they blame the fast food business. We staked out a few McDonalds but failed to see any covert operations that forced the fatties through the drive-thrus.
They're unhappy because they eat and they eat because they're unhappy. Go figure.
