This article was subsequently debunked by This American life, and many of the comments here are confused.
Dr Kwak was a real person, and the letter contains historical facts linking it to him. His family says the letter is genuine. According to blind studies, the symptoms described in it are experienced by a small percentage of the population, but MSG is harmless to everyone else.
The article links to the This American Life podcast in question, here is the transcript:
Dr Kwak was a real person, and the letter contains historical facts linking it to him. His family says the letter is genuine. According to blind studies, the symptoms described in it are experienced by a small percentage of the population, but MSG is harmless to everyone else.
The article links to the This American Life podcast in question, here is the transcript:
https://www.thisamericanlife.org/668/transcript