have already been proven. Energy can't be created or destroyed it only changes form and energy always moves
towards a state of 'least resistance' hence life's pressure to maintain, hold or create greater order - it is in fact the reason people
search for meaning and create Gods..which ironically sets them looking away from where they sit which is in the answer..the energy that is in all life and breaks down to support new life...that is God.
-Though I can appreciate the desire to have a visible workable proof - which could take the form of not eating until you have so little energy
you can barely move and then eat a cow and see if the energy that sustained that cow doesn't move through your system and re-energize you.