Meat has lots of Tryptophan and Tyrosine which are the precursors for serotonin and dopamine, the molecules most anti-depressents aim to modulate. I am a layma

Meat has lots of Tryptophan and Tyrosine which are the precursors for serotonin and dopamine, the molecules most anti-depressents aim to modulate. I am a layman, so not an expert, and I don't have a source for you for causality, but it sounds plausible to me.