Did you know that it is very difficult to find any food in Japan without added MSG? If you eat in non-organic restaurants, chances are you are consuming MSG with every meal. The only way to avoid it is by cooking your own food...or so E thought.
It turns out that almost all packaged food contains MSG as well!
...but not all packaged food. Y taught E the kanji for mu-ten-ka, which means "no added chemicals." Look for it on packages of soup stock (dashi), miso, or pretty much anything in the grocery store.