Think twice before picking up that bento!!!

http://search.japantimes.co.jp/cgi-bin/nn20060721f1.html
I am by no means a health nut but this is the part which really scared me:

While the negative effects of many additives on human health have not been proven, Abe pointed to a disturbing Nishinippon Shimbun article, published on March 19, 2004, about pigs that were fed convenience store food.

The article said a pig farmer in Fukuoka Prefecture in 2002 fed 25 pregnant pigs only convenience-store bento and rice balls -- free because they had passed their best-by dates -- for most of their 114-day gestations. All of the pigs had either stillborn births or the piglets had birth defects.