Here in Korea there are literally millions of medical myths. Here are a few off the top of my head...
-Eating eel gives you sexual stamina
-eating octopus gives sexual stamina
-any food shaped like a winky gives sexual stamina
-ginseng cures all
is good for your health
-parts of your feet represent organs in your body and can be stimulated to relieve pain in these organs (I emailed about this recently)
-doctors routinely prescribe loads of different pills without ever explaining what they are for. when quizzed, the regular response is, "you wouldn't understand." I think they are chinese herbal pills.
-kimchi cures all
...I'll see what else I can find
On a related note, a friend of mine has a grandmother who claims to have eaten nothing but boiled onions for the past decade. The only time she strays from her all-onion diet is when she goes to her daughter's house for Sunday lunch. She claims that onions are the key to her health, and she does seem to be in very good shape for a woman of 90. That said, other people live long lives while enjoying rich and varied diets, but I'm not about to try to slam a nice old lady, either mentally or physically.
Is there any chance that there is something to the all-boiled onion diet?