Year: 1987 Source: Omega, v.18, no.1, (1987-1988), p.71-76 SIEC No: 19871307

It was hypothesized that when relative dietary intake of tryptophan per capita is low compared to certain other amino acids, less serotonin is formed in brain neurons, and suicide rates tend to be high. The hypothesis was supported for males and for both sexes combined.