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.
How It Feels. During an EMG test, you may feel a quick, sharp pain when the needle electrode is put into a muscle. After the test, you may be sore and have a tingling feeling in your muscles for 1 to 2 hours. If your pain gets worse or you have swelling, tenderness, or pus at any of the needle sites, call your doctor.