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Judging by the size of these kids, I don't think there's any risk of them going hungry.
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Let's not confuse cause and effect here.
In terms of McDonalds and salt; I heard that they're saving millions by not putting salt on originally, because whilst 90% of the population liked the amount of salt on the fries, there were plenty of people who prefered to go without and even more (people called autocondimentors) who will add more salt irrespective of how much is on already. So by letting everyone choose for themselves, less salt is used overall and they save megabucks.