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I find it interesting that you (and she) use the drug metaphor because I think it is spot on. In fact I'm not sure we can call it metaphor; I think we can take it quite literally. What is sold as ostensible food is carefully engineered to be literally addicting. And as you quite rightly point out this is a profound class issue: it takes far more time and money to eat well than most of the poor can muster. In fact, I suspect that part of our societal distaste for the overweight can be attributed to our hatred of the poor, who are constantly demonized as being lazy leaches and the scum of the earth.