Me.
Anything that dehydrates me and gives me sensations after consuming is not to be consumed.
Common sense rule.
Edit after reading excited raves on how to discuss MSG;
This is from observing effects on my own body.
I stated it knowing full well the FDA findings and conclusions, but since I observed these effects despite believing all I had read,I would need to suffer insanity to deny reality and follow a belief.
YMMV