Weighing yourself hourly to see how quickly you're burning energy is misguiding. When you burn carbs/fat you're not expelling them from the body. You're converting them to another form in a process that releases energy that your body can use. E=mc^2 considerations aside, as you wouldn't be able to detect those differences anyway, your weight is still the same. The waste products later get expelled when you go to the bathroom, sweat, etc.