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Another landmark study has revealed great insights: depressed people eat more chocolate. Check out the peer-reviewed detail, especially the part that notes "Higher . . . depression scores were associated with greater chocolate consumption. Whether there is a causal connection, and if so in what direction, is a matter for future prospective study."

Ogden Nash was pretty dismissive of worrying about causal connections in his poem "Which the Chicken, Which the Egg:"

He drinks because she scolds, he think;
She thinks she scolds because he drinks;
And neither will admit what's true,
That he's a sot and she's a shrew.

(More fun and less insightful is his "The Perfect Husband:" "He tells you when you've got on/ too much lipstick/ And helps you with your girdle/ when your hips stick.")