[_0w8t]

If one is very poor, one cannot afford money to get prepared food and forced to prepare food themselves no matter how weak is the will power. And that will be much healthier. The problem is that in Westen societies such extreme poverty is rare and people can afford junk food and advertisements heavily inclines them to get it.

[tamana]

The problem is also that it is easy to buy some cheap bad food while not saving up for rent/car/school payment. In other words, even though we can't afford our lifestyle, food dolllars are the first dollars, and we go into debt for the rest. So we can over spend on convenient food while still being broke.