[pliny]

>What you eat absolutely affects brain chemistry. Eg friends of mine in grad school were studying depression via tryptophan depletion. They'd give volunteers a homemade protein drink which would reliably knock down serotonin levels. In other words, a milkshake that made you depressed. No drugs required.

They tried to induce depression? That's prison camp science, do your friends study at the Josef Mengele memorial faculty of Medicine?

[amirmc]

No, they're at the University of Cambridge, working with volunteers who've provided informed consent as part of an ethically approved study. An example of one of the papers is below [1]. The serotonin reduction I'm referring to is temporary.

[1] http://www.ncbi.nlm.nih.gov/pmc/articles/PMC2775933/