I found this cute little study today, if you follow the link from pubmed and click on the PDF you can get the full text for free.
In the study they made people drink test meals containing alot of carbohydrate and protein, and added either 2g MSG or some salt to them. The group that drank the test meal spiked with MSG had reduced postprandial glycemia ( good ) and significantly increased GLP-1 secretion ( good )
Ive blogged thousands of times on the beneficial effects of GLP-1 with respect to body weight control, glucose tolerance etc so im not gonna bother rehash its merits here, suffice to say that I think all the controversy surrounding MSG is overblown and false. Ive never had a problem with it myself, and I absolutely love things like parmesan cheese, soy sauce, marmite etc etc.
So does this mean consuming MSG may actually be beneficial? MAYBE. Indulge in self-experimentation is what I would say.
suppversity also has a very comprehensive post on MSG.