Q: What percentage of muscle do you lose by starving yourself
A: There's no way to give a simple answer to this since it depends on so many variables -- physical activity level, exact diet, current body fat levels, metabolism, health, age, etc. But all you really need to know is that unless you have a good medical reason to lose weight very quickly and/or to eat very very few calories, you'll get far better results in the long run by eating enough to lose weight slowly. It'll take a little longer but you'll be actually losing fat AND keeping it off afterwards.