Photo: Amir Moharrami / Unsplash
For decades, if you went to your GP feeling down or depressed, you were probably told some version of the same thing: that your brain had a chemical imbalance, probably involving serotonin, and that medication would correct it. It was a convenient explanation that seemed to make sense, and so it stuck. By the early 2000s it had moved from clinical shorthand into everyday language, the kind of thing that people took as a given when discussing mental health.
But we now know that the evidence never really supported it.
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