Smithsonian National Museum of Natural History

 

Femur from a very heavy male appears to be normal
Femur of a male, age 42, who weighed 600 lb (272.2 kg) at death.Image courtesy: Smithsonian Institution

Although his bones look normal, they are extremely heavy, due to chronic obesity.  His skeleton weighs 16 pounds — compared to a total bone weight of 13.5 pounds for an adult male of similar height and age whose body weight is 200 pounds.