An entity scientifically shown to leave the body upon death. Where did you read that, in one of your Arthur C Clarke novels? You do realise that you are bordering on the ridiculous here?

Forgive me for calling you religious, I realise there is a big difference.

So there is a miniscule amount of weight lost just after the point of death. Maybe this is the lungs emptying, bladder etc. They all go you know. Even the liquid around your eyes dries up.