This is quite a heart wrenching, but inspiring story.  A few years ago, David Smith weighed an unbelievable 650 pounds.  He had no social life and  was so severely depressed, he considered suicide as a way to end his pain.   Now, at 32, he's dropped over 400 pounds of weight and has become a personal trainer.  

His tale, "A 650-pound Virgin", airs tonight on TLC.

To read more on this story, please visit the link below.