After a median follow-up of 6·2 years, 493 cases of depression were reported. A higher risk of depression was associated with consumption of fast food (fifth (Q5) v. first quintile (Q1): hazard ratio (HR) = 1·36; 95 % CI 1·02, 1·81; P trend = 0·003). The results did not change after adjustment for the consumption of other food items. No linear relationship was found between the consumption of commercial baked goods and depression. Participants belonging to consumption quintiles Q2–Q5 showed an increased risk of depression compared with those belonging to the lowest level of consumption (Q1; HR = 1·38; 95 % CI 1·06, 1·80).
Conclusions: Fast-food and commercial baked goods consumption may have a detrimental effect on depression risk.
Maybe we shouldn't have a McDonald's at Sea-Tac? Airports are pretty depressing already—even if you're going somewhere awesome, you have to take off your shoes and get porno-scanned and wait and wait and wait, all with overpriced drinks.
Thanks to Rob Man. And let us note that many—maybe most—people eat fast food because they're poor (among other factors) (with poverty certainly not itself obviating sadness).