Kimchi

I'm not keen on yogurt (how can you tell when it spoils?), but apparently the same sorts of benefits can be had by eating kimchi. Don't overdo it, as the article points out--it has lots of salt and too-great an indulgence increases the risk of stomach cancer. But the magazine Health listed kimchi among the world's 5 healthiest foods. Take all such magazines with a grain of salt, of course.

It is also good to eat when you want to be alone for a while.