http://www.naturalnews.com/026364_fluoride_pineal_gland_sodium.htmlread that
also, the Pineal Gland deals with regulation of serotonin and melatonin. This regulates feelings of happiness/ ecstasy or depression.
It's calcification of this gland that is partially responsible for the fact that a large portion of the population claims to be "depressed".
If you want scientific backup, it's really not hard to find it. Google isnt' 100% regulated by the government yet and if your here your still enough of a freethinker to know where to go to further research.