Monosodium Glutamate is a food additive used to artificially improve the perception of food flavor. It is classified as an excitotoxin and is considered by many independent health researchers to be harmful to human health, causing problems from obesity to ADHD. The FDA, however, maintains that MSG and other glutamates are safe and healthy to consume. 
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- "MSG and Aspartame Are the Two Leading Causes of Central Nervous System Damage in the United States | The Liberty Beacon." The Liberty Beacon. 25 Feb. 2013. Web. 3 Dec. 2015. <http://www.thelibertybeacon.com/2013/02/25/msg-and-aspartame-are-the-two-leading-causes-of-central-nervous-system-damage-in-the-united-states/>.
- Zeratsky, Katherine. "Monosodium Glutamate (MSG): Is It Harmful?" Monosodium Glutamate (MSG): Is It Harmful? Mayo Clinic. Web. 3 Dec. 2015. <http://www.mayoclinic.org/healthy-lifestyle/nutrition-and-healthy-eating/expert-answers/monosodium-glutamate/faq-20058196>.