The world is divided between calm people with a long 5-HTT gene and anxious individuals with a short 5-HTT gene. People with a short 5-HTT gene live with constant electrical activity in their brain's fear center. Here's one life story chronicling the genetic basis of agoraphobia and panic disorder, one woman's war against the fear of going outside. You may be predisposed to either anxiety or depression if you have a short 5-HTT gene. Look up the article reporting a study that links depression to an overactive fear center in the brain titled, "Bound for Gloom and Doom," Proceedings of the National Academy or Sciences, October 11, 2006. You can find this online at ScienceNOW Daily News. Online, check out ScienceNOW's search engine at: http: //sciencenow.sciencemag.org/cgi/search?searchtype=article&andorexacttitle=or&fulltext=bound+for+gloom+and+doom. Your genes react to different foods, vitamins, and treatments. If you're concerned about hormonal imbalances and genetic predisposition, such as a short 5-HTT gene, how your body metabolizes nutrients or what defects are in your autonomic nervous system, then discover genetic causes of vitamin over stimulation or under absorption. Here's how I burned out agoraphobia and panic disorder with mild exercise such as walking in place and nutritional changes. Research your individual issues from my detailed experience.