What happened to my body hair?

The photo on the left was taken in Feb 2007.  The photo on the
right was taken in March of  2012.  The color shift
is due to changing the light bulbs from incandescent to
florescent and the skin color difference is due to my
 recent arrival after two months in Jamaica.  The loss of body
  hair is a complete mystery.  It was so gradual that I wasn't
aware of it until I  came across the older photo while searching
for something else. Other than an additional ten pounds (and the
missing hair), the pics are amazingly similar.  Any ideas on the reason
for the loss of body hair?