Hi,
There is no denying the fact that we feel more alive when we eat food and breathe air. Hence our life energy must be originating from the ordinary energy like chemical, kinetic and electromagnetic energy that we know of.
Considering the above we can say that life is also a unit of energy and yes it is transformable. But life energy transformation I think takes place in the brain not in the stomach

I think we ARE made up of energy and void.Nothing more.The only difference between us and a rock is that we are a form of organic matter instead of anorganic.Everything that exists is just another form of energy .Have u read Democrit? If not, read what he stands for(u won't regret it).I think he can explain it better than me.