OK so two things.
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They say "may" because it is not definitive that there is a causal link. It could just as easily be (and frankly, likely might be) a reverse cause where growing depression makes you less inclined to worry about purchasing and preparing whole foods yourself, or that the link might be correlated to another cause like financial troubles which cause both depression and more cheap and convenient food choices. Maybe the food does cause depression but that is not yet conclusive.
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"Processed food companies are fucking criminals" so... there's a lot to unpack here. Are you suggesting that they KNOW it causes depression and make it anyway? Or even that they intentionally make it cause depression? Because there is absolutely no reason to think that, if it even provably did. They're guilty of contributing to the general unhealthy dietary habits and all the other ethical problems that come with a profits over people business model that applies to nearly every capitalist business. But that doesnt seem to be the source of your comment.
This is valuable research and is a step towards understanding how food and mental health may be connected. But you are jumping to all sorts of conclusions, my guy.
