Nowadays there's like worldwide inflation...ok i dunno if its worldwide but in most of the places it is the case. Money is a very sensitive issue to most of us, and one of the main reasons why we turn to junk food is not only is it yum, but it's relatively cheap. Also I'm assuming here that there's lots of poverty in the US? Maybe they are one of the main customers of junk food, and if junk food prices are raised, they will no longer be able to aford it and will have to turn to healthy food insated
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Longing for a new start :)