Calories with Insanity

Hi everyone, So I am on my second week of insanity and I have been eating around 1200 calories a day. I've been reading alot that 1200 calories isnt enough when doing insanity. I have a hrm and I burn around 500-600 calories per workout. I am 22 yr female 5'5 and a 160 pounds. I talked to my doctor about insanity first because I have a metabolic disorder, she said that I should stick to around 1200 calories a day but she said that she didnt know what insanity was. I explained that it was a intense workout but she said stay with 1200 calories if I want to loose weight.

I just wanted to know what everyone thinks. It hard to figure out what to do because she doesn't know how hard insanity is but shes a doctor..... anyways any thought would be awesome to hear. Thanks!