If i might make apoint no one wants to hear who is on a diet...... you need CARBS to fuel that long of a workout, and you are also doing the workout in the wrong order, or so ive been told by my trainer.....on days when you are doing strength training also, you should eat a light carb right before workout (within a half hour), and then IMMEDIATELY after strength training have a protein (shake, egg, whatever), THEN do your cardio...by that point, the resistance training will have depleted your muscles of most of its glycogen stores for energy ( we only keep 90 minutes to 2 hours worth in our bodies stored) and your body will have to begin burning fat for energy to fuel your cardio...also, strength training is mUCH more effective when your muscles are NOT already depleted of glycogen...I do not know what type of diet you are following, but as a distance runner i can tell you that long workouts drain you, and you need to keep your body PROPERLY fueled...not necessarily DIET fueled, if that makes sense......
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