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Salt would not do it.
Pretty much everything you eat has salt.
I am talking about substances no one would expect to be in something.
People expect all sorts of things to be in food: the main ingredients, preservatives, coloring agents, etc. No one expects a chemical designed to increase the addictive nature of salt, for instance.
But that's not what the article talked about. Salt was the major one, but food texture (they have figured out how crunchy to make Cheetos in order to make the brain think you aren't full) and multiple flavors (e.g. Cherry Vanilla Dr. Pepper) are also contributing factors.