Unbelieveable amount energy with low-carb... what's the biology behind this?

"Bad" stuff You mention is so since its known to human organism since like 50 years only,so it has no idea how to deal with it.If You go on carbs etc that are better known to Your body(no "Macburger" or "Cola" close here),Your body has known mechanisms of how to deal with it.Cola producers know worse what to give it than veges and fish.