People eat what they eat as part of their food culture - poor people who grew up eating junk food are accostumed to eating it, like the taste, and therefore buy it. It remains JUNK food because of its low nutritional value, and actually, you can find much cheaper calories at a supermarket than junk food, food that is still not great for you, but at least provides mjore nutrition than something like a bag of cheetos.
i.e. they are deciding to trade nutrition for flavor because they value the latter more highly than the former
Junk food is not good for someone - period. And how does taste "offset" the health effects????
Negative health effects are only bad because they make people unhappy. Yummy flavor is only good because it makes people happy. There is a tradeoff between the two and some people value the latter more highly than the former.
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