I burn between 2300-4000 calories a day, 6 times a week through intense cardio. !

I burn between 2300-4000 calories a day, 6 times a week through intense cardio. How many calories should eat?

How many calories should I eat to keep from losing muscle but maintain a decent amount of weight loss? According to several sites, my body should burn around 3300 calories a day not counting the hour and a half to two hours of intense cardio. I've been keeping my calorie count around 1200, but I'm afraid that is not enough for maintenance of muscles as well as keeping my metabolism at a decent level. Any and all knowledgeable help is welcome.

( And for those who think that the workout is a bit excessive, my doctor has been running test to make sure I can handle it).

1 week ago
For those wondering how the calories burned is possible, it's on a a stationary recumbent bike on the highest resistance at an average of 23 mph. I've checked the calorie counters on several bikes ( same type and different) and with the same type bikes the count is the same. With other bikes the count is between 50-100 more or less.

everybody is different. you have to play around with your calories.i think 1200 is very low for someone as active as you.i would try to stay at 2500 a day. make sure its quality calories. make sure you have a steady intake of protien, at least 300 grams a day. this will help you from losing muscle.