You may not know it, but food can act as a powerful drug.  Yes, foods high in carbohydrates can increase the neurotransmitter, serotonin, in your brain.  You have probably felt its impact - you eat a large meal of pasta and bread and you feel really calm and peaceful and, of course, satiated.  When you increase levels of serotonin, you can induce a feeling of well being and actually calm anxiety.  If serotonin drops, then you can begin to feel irritable and moody, and if you have felt the...