I agree with what Rb says...She only pointed out the fact they see proof between normal levels or serotonin and people who have less. How come they can't say why those people have low levels? Low calcium intake = weak bones. What causes it? If you keep medicating and you have no clue what the real cause was, you only end up decreasing natural body defenses and the person is stuck with the medication for LIFE. Not to mention if you get off the medication you can end up having far more problems.
-to be nobody but yourself in a world which is doing its best, night and day, to make you everybody else means to fight the hardest battle which any human being can fight; and never stop fighting.- e.e.cummings