"Don't remember exactly when, 70s or 80s, but the Air Force actually boasted that 'in the next millennia we will control the weather' (paraphrased. I don't remember the exact quote.). In those days I was just…"
"If you exercise on empty stomach, release of the growth hormone increases up to 2,500%.
Your brain will be able to switch from glucose to fat burning. The fat in question, is your own body fat.
Give it a go. Works for me."