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Because adding fat (usually in the form of vegetable oil) and sodium is the cheapest, easiest way to make food hyperpalatable, and the share of the grocery store shelf space occupied by these products has exploded in the last 40 years, greatly contributing to the obesity epidemic. Ominously, this a trend that the researcher behind that paper I linked to attributes in large measure to the tobacco companies entering the packaged food business: https://onlinelibrary.wiley.com/doi/10.1111/add.16332