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		 Anorexia is surely impossible to understand fully for non-anorexics, however I can imagine that biochemical differences and changes occur with chronic undereating - leading to a snowball effect.   
 
Tanning on the other hand....  I've used a tanning bed and it feels sorta pleasant and warming.  But addiction?  What chemical changes could come about from it that cause a repeat desire.  Besides she only does it once a fortnight.  That'd not be enough to matter if there's some chemical/pleasure-reward mechanism going on surely.   
 
If I smoke once a fortnight I don't call that an addiction. 
 
Tanorexia has got to be a useful term for those teenagers that overcook/overpaint themselves though.  Sure know that I'm going to use the tag - thanks ! 
		
		
		
		
		
		
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