Myth: You should steer clear of MSG.

Truth: Monosodium glutamate is an ingredient added to many foods to enhance their flavor, and it's completely safe to ingest.

MSG is often associated with a series of symptoms including numbness at the base of the neck and a general sense of fatigue that are commonly lumped together and called "Chinese Restaurant Syndrome." Eating too much, regardless of the amount of MSG, is the more likely culprit here.