Originally Posted by milambur

My guess that you are getting fatigued so quick is that your carb intake is way to low. Given you probably burn 3000 to 3500 kcal a day your carb intake should be about 400 to 450 grams a day, but make sure that you don?t eat more than 20 grams sugar a day. If you are active and have a low carb intake the body might use protein instead of the fat as energy. It is the carbs that regulate the amount of fat the body store, both a high carb intake and a low carb intake will cause the body to store or maintain stored fat. Besides the body doesn?t really start to burn fat until after an hour of training, before that it relies mainly on carbs, so if you start to get tired after 30 minutes your body probably will not burn much fat when you work out, that is why you still have relatively high body fat given how active you are.