As these inappropriately dubbed "fat cats" tuck into modest portions of healthy food, sipping water or smoothies, it becomes clear that their wealth has not inspired excess - or at least not excessive eating.

BBC: Davos 2013: Obesity not a problem for the rich

Unlike smoking, or excessive gambling and drinking, eating junk food does not directly impair the well-being of anyone else.

ECONOMIST: Does a tax on junk food make sense?