It is your connection to the outside world. The alimentary canal aka the gut. 5 pounds/2.3 Kg of flora and fauna living on the walls and in suspension in "hole in the doughnut" that is where we derive energy for all our life activities.These colonies and communities are not part of us(not human tissue but have evolved to exist in symbiosis) yet we need them as much as they need us. It is also where we acquire pathogens that can infect and start "eating" us. Keeping the intestinal flora and fauna healthy is discussed here.
http://yourownhealthandfitness.org/
available as a free podcast until 10/27/09.
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