The Soul? Real or Fake

I know that this topic is all based on faith for the most part, but I was reading The Lost Symbol by Dan Brown earlier (I know, I know Fiction but roll with this) and in the book the one character (Katherine) conducts an experiment that proves that the human body lost some kind of weight right after death.

It got me thinking about this, I never really thought that souls were real, but if science could prove somehow the same thing that the book claimed, I think I could accept the reality of a soul.

What're your thoughts?

*P.S. : Not finished with the book so no spoilers please.