After decades of study, there remains no clear evidence that serotonin levels or serotonin activity are responsible for depression, according to a major review of prior research.

Note: I link to a bunch of paywalled studies in this essay. Please do not use sci-hub to access them for free and do not use this trick (a) to easily redirect papers to sci-hub.

For the clearest example of deliberate data manipulation, see how Walker edits…