Bottom line, IMHO, is calories burned = calories burned. However, if you're at your aerobic threshold and then, perhaps, over-eating later because you worked out so hard and got SO hungry, that could be it...
You made changes in your diet - what are you eating? Do you weigh/measure EVERYTHING and account for every single bite? If not, then I'd suggest (even if only for a week) you do so and figure out what you're really burning.
Also, look at activity OUTSIDE the gym / workouts. Working out doesn't help much IF you're so tired that you sit on your tush the other 23 hours of the day...
But burning sugar "instead of" fat = load of crap... you may burn PREDOMINATELY more of one fuel source than another at various intensitites, but bottom line is you need to be burning cals and eating fewer cals every day than you burn to lose weight...
Hope that doesn't sound harsh, but my guess is look in the kitchen before you worry about "burning sugar"...
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