Don’t know about the goal of killing all those eaters but I do remember the FDA pulling L-Tryptophan because some women were od’ing on the stuff to help them sleep, weren’t all that many from the report.
They were not overdosing on trytpophan.
They were overdosing on the drug MDMA, ecstacy.
They were also taking tryptophan, a normal amino acid, along with the mdma to enhance the effects. The mdma was what they were overdosing on.