Acute Tryptophan Depletion results in worsened symptoms...

From lef.org article on OCD:

"Another dimension to these findings was added by a double-blind, placebo-controlled study at McGill University in Montreal, in which researchers found that acute tryptophan depletion caused patients to experience significantly greater subjective distress when they were provoked with triggering situations (Berney A et al 2006)."