Wow. I have read some steaming piles of crap in my day, but this one absolutely tops them all! I don't even know where to begin pointing out the holes in this insane statement, because it is all holes and no fabric!
All of the energy in our brains and body come from the food we eat. When we stop eating, no more energy. It doesn't "go" anywhere! (Besides, Einstein was too intelligent to believe in religious garbage like an "afterlife".)