Skeptical on Diet Pills Posted at 10/27/2010 09:25:00 PM 0 comments (+) One of the reasons why I am so skeptical to try diet pills is because of the scary stories I hear about diet pill side effects. I've read that some diet pills can cause diarrhea, headache, hypertension, palpitation, dizziness, insomnia, rashes and so on. Even those clinically-proven pills have side effects too. That's why I'm determined to lose weight naturally because I don't want to suffer from any of the side effects I mentioned above.