AlbinoAssassin said:
Of course this diet will jeopardize muscle tissue, all diets do. When you are losing weight you will always lose (even if you aren't natural) a certain amount of muscle mass. This is especially true if you are doing cardio on top of low carbs. I think you should up your calories and drop the cardio. The slower you drop the weight the more muscle you will maintain. Good luck bro!
I'm gonna gauge by my strength. If I notice I am losing strength than I will immidietely add more calories.

-sk