What causes the leaves to fall from pepper plants?

From what I have read around the internet, one of the main causes for this is improper plant nutrition of some kind. It is happening to me right now because I used too much MiracleGro, so the plants were getting too much nitrogen, which caused some yellowing of the leaves and the falling leaves and flowers. I ran across this site, which might be helpful to you, they talk about this very thing, and someone was successful in saving their plant by using an epsom salt and water mixture.

http://forums.gardenweb.com/forums/load/pepper/msg0614591310637.html