To reply to a now deleted comment about weight loss:

You will still lose "muscle", and some of that will be in the fat embedded into the muscle.

I would recommend checking out some of the learnings from the keto diet. You may or may not subscribe to it, but they had to very carefully tread these lines when the body was essentially in starvation mode. A few things I know of:

1. You have to maintain a certain amount of protein intake (~10% to ~20%) to prevent your body burning lean muscle mass.

2. Too much protein gets converted into sugars, these in turn are easily stored as fats.

3. Maintain exercise, use it or lose it.

4. Don't over-exercise. "Exercise flu" results in limited performance and muscle loss through gluconeogenesis. You break down muscle and convert it to energy due to lack of carbohydrates.