Interesting, I have not gone that deep. All I know is, calories do not magically teleport inside a body. Just fasting is easier for me. I still eat like crap, just less crap. No sugar drinks of course.
I tried many times, I usually recover the weight. This time around I have been going months and I don't feel the disappointment that builds up over time due to lack of flavor. I have variety, I think it's key