Hi simcoeluv,
I cant remember if it was you or someone else wanting to know about sugar vs artificial sweeteners. I asked Dr Peter Attia about it and the jury is out at the moment. Some studies show a correlation between weight gain and AS and some do not. His advice was to stay away from them until the science is more definitive. Sounds reasonable to me.
With respect to training your system (liver) to burn fat more efficiently I am basing this on my personal experience, so hardly a scientific study. When I fist started IF I was not able to bike ride during my fast day. Now I can do it with ease. Reading a bike forum, low carb training is now common/accepted practice amongst top professional bike riders as a means of increasing their ketogenic performance. I just use a simple keto-stick to measure my ketone bodies and by the 36 hour mark Ive started ketosis. By the end of my second day (60 hours) Im well and truly into ketosis. Not advocating anybody else do this, I just find doing IF with zero cal days to be easy for me.
9:03 pm
12 Feb 16