During the latter half of the 20th century and into the 21st, monosodium glutamate (MSG) was widely stigmatized for its supposed health concerns. However, the ingredient is safe.
Despite decades of misconceptions, a market research firm called Mintel recently found that over the past half-decade, 75% of all social media posts about MSG were positive.
Nobody had a problem with it until 1968 when the New England Journal of Medicine published a letter from "Dr. Ho Man Kwok" (actually Dr. Howard Steel).
The entire claim was fake, but it did real damage, creating a mass hysteria in which Americans spent decades fearing MSG over "Chinese Restaurant Syndrome."
However, if you check out the latest Merriam-Webster definition of "Chinese Restaurant Syndrome," it will indicate that the term is outdated and offensive.