Originally posted by: JohnOfSheffield
Originally posted by: Jugernot
Your body is going to burn more muscle than fat because it is preparing itself for starvation. During the starvation phase, your body keeps fat, which has a higher per pound nutrition value. It will burn enough muscle till you feel very lethargic and the fat will start coming off. Once you start eating again, the body will build the fat first before any muscle is regained. It will make the process of getting healthy even harder later.
Actually, this would depend on his level of activity, your body ALWAYS burn fat as it's primary source during inactivity.
Breaking down muscle tissue and then converting that into ketones to use for fuel is a hell of a lot harder for the body to do than to break down readily available ketones stored in your liver at first and then from fat.
It is true that your body reacts a certain way to starvation though and it's also true that any diet that is not sustainable with a few upshifts to bulk and downshifts to cut isn't a good diet.
If you are considering a diet, you should be prepared to live on it for the rest of your life and only upshift or downshift the nutrients. Find a baseline diet and go from there, if you need to cut a few pounds then downshift the carbs for a couple of weeks/months/what you need.
There really isn't another way that works.