It's all just a little too convenient. According to every source on Japanese cuisine I've ever consulted, the single most unpalatable food to non-natives is Natto. As it happens, a recent Japanese study reported by Reuters has uncovered a new vitamin - pyrroloquinoline quinone (PQQ) - which is found at high concentrations in, you guessed it, Natto. It sounds like a government sponsored ad campaign to me, if only because "PQQ" looks a little too much like an emoticon to not be geared toward the Hamtaro crowd.