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paulpauper
The obvious cofounder is that people who drink coffee a lot have a higher socioeconomic status, better healthcare quality or a less dangerous job. It's like those studies that show drinking wine raises life expectancy.
perilunar
44% of the participants were drinking instant coffee. I don't think socioeconomic status is relevant.
byteduck
…Because only poor people drink instant coffee?
perilunar
No, because poverty is not a barrier to drinking coffee.

Drinking freshly-ground coffee may be linked to socioeconomics status, but drinking coffee probably isn't.

byteduck
I see what you mean, I misunderstood.
smabie
Even so, I imagine that people who don't have jobs drink less coffee (they don't have anywhere to be). And those same people are probably of lower socioeconomic status.
eurasiantiger
I wonder if this study is a bit one-eyed. Coffee contains certain neurotoxic amines of the beta-carboline family which can also cause anxiety and depression.

Does it make you live forever but unhappy?