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.
MSG is often found in canned foods, processed meats, Chinese foods and other processed foods. Though there are no MSG-specific allergies, the Merck Manuals Online Medical Library states that some people may be sensitive or intolerant to MSG, presenting with symptoms that mimic an allergic reaction. Symptoms may develop within minutes to hours after ingesting MSG.