The United States, the world's largest economy, accounts for approximately 25 percent of Nominal world GDP, and the seven largest economies (amalgamating the European Union economies as one) account for 75 percent of the total.
For this reason, when MSG is added to food, the FDA requires that it be listed on the label. MSG has been used as a food additive for decades. Over the years, the FDA has received many anecdotal reports of adverse reactions to foods containing MSG. These reactions â known as MSG symptom complex â include: Headache.
Sometimes, however, anaphylaxis can occur a half-hour or longer after exposure. Anaphylaxis symptoms include: 1  Skin reactions, including hives along with itching, and flushed or pale skin (almost always present with anaphylaxis). 2  A feeling of warmth. 3  The sensation of a lump in your throat.