Burning fat or muscle while fasting?

[S11m]

Most of us are trying to retain or increase muscle mass, or fat-free mass... and/or to lose weight. (I am at my target weight.)

This video states that you can only burn 30 calories of body fat per pound of body fat per 24 hours... I have not seen this anywhere else, and I had not heard of these gentlemen before, but it seems to make sense.

I burn 2,000 to 3,000 calories per day (according to my gizmo), and, according to the above, I can get less than 1,000 calories per day from my bodyfat. You can burn protein, but not all protein is muscle: Autophagy might be getting energy from loose skin etc.

How you fast depends on what you are trying to achieve... no calories for weight loss or no carbohydrate for diabetes etc. I think I might start having cream in my coffee when I am fasting?

youtu.be/jH2wQ8OY1fc?list=WL(Not working as expected?)

[Subtle_badger 16Kg IF 72hrs]

So according to this, you must lose 250g of protein every fasting day. I think you would notice if you lost a kg of lean mass on your 100 hour fast.

Still, I'll have a listen to this and see what I think.

[S11m Volunteer 70lb IF20 in reply to Subtle_badger]

Muscle lost through autophagy is hopefully soon re-created.

It is not mass that is lost, but calories... according to the video, after using up any energy I have in my digestive tract or in my glycogen store, if I continued to use energy at 2,000 calories per day, 1,000 calories would come from sources other than stored body fat... and this would include non-muscle protein, junk, etc.

According to my fat-callipers and deliberations, I have lost 6kg of fat-free mass in 19 months.