Do fat people have more chances of developing nitrogen bends?
Well, you're right! First of all, 


  Nitrogen Bends or Decompression sickness (DCS) is a disease that arises as a consequence
  of bubbles forming within tissues. Inert gases, such as nitrogen
  and helium, enter the body through the lungs during inspiration.
  
  Increased BMI (Body Mass Index) implies an increased fat content of the body. This
  increased body fat leads to increased nitrogen storage and hence
  possible excessive nitrogen bubble formation and thus increased the
  risk of development of DCS.


Learn more about the relation between Fat and Nitrogen Bends by reading Diving and Hyperbaric Medicine  Volume 36 No. 3 September 2006