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I’m curious if this is more of a correlation vs causation thing. All of these things are much easier to do when not depressed, so I wonder if that affects the findings.
If I understand correctly, the study looked at people over time, so what is investigated is the behavior of mentally healthy people and what happens to them in the future.
It’s still not perfect, since they used a date of diagnosis as a proxy for people becoming depressed. This is actually mentioned as one of the limitations in the study (in the second to last paragraph of the Discussion section).