You need to exercise to stimulate muscle growth. If you incorporate strength training during IP, you will then retain muscle. It is hard - at least for a woman - to gain muscle on IP, but you should be able to keep what you already have. I think you should have no problem loosing fat. The only thing I can say (and this may not apply to men) is that IP is a tricky diet if you have an imbalance in your thyroid and sex hormones. There is also crosstalk between the systems that regulate estrogen/progesterone levels and thyroid hormone production and both are regulated indirectly by carbs. So, maybe check your hormone levels diligently and/or talk to your doctor.
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