aspartame is a methyl ester of a dipeptide between phenylalanine and aspartic acid. it's the pheynlalanine which is the neuroactive. to say aspartic acid is a "cousin" of glutamic is like saying that mice and men are cousins since they are 95+ % composed of the same materials. structure & chirality are but two fundamentals overlooked in the article. aspartic acid is everywhere, in most, if not all of the food I eat. I love aspartic acid. same is for phenylalanine. the deal is, that it's the exact distribution which is controlling.