Do you have any idea what is MSG or the Mono Sodium Glutamate? Well you should be aware of this thing and how does this thing greatly affects us.
As a small introduction of MSG, it is is a salt of the amino acid - Glutamic Acid (glutamate). A salt is the chemical name for a molecule held together by opposite charges. Basically one (mono) sodium atom is "stuck" to the amino acid glutamate. Basically you will gonna learn more about this stuff later of this post.
Actually this MSG is just considered as a trick to your tongue into making you think a certain food is high in protein and thus nutritious. It is not a "meat tenderizer". It is not a "preservative". The food industry is trying to confuse the issue by focusing on the "fifth" taste sense they call umami. Well the TRICK means a lot, it could be one of the deceptions we are not expecting that we already fall into with.
This video was a good explaination about it. Try to see it for yourself.