12 000 people and resulted in at least 12 deaths. However, despite intensive investigations, the source and carrier of the infection remained unclear. The whole nation went into panic about the unknown source of the infection and many studies were immediately initiated to seek for functional foods with bacteria-killing potency. To date, although numerous food-related books have been published in this area in Japan, many of them lack their own data, and are just collections from other books. Information is passed around from book to book just by changing the titles and they are repeatedly using the same old data. In this chapter, I will advance the debate on the food functions of garlic, vegetable odors (flavors), sweetcorn, mushrooms, and Japanese cypress oil (hinokitiol) by introducing our own new data.