jcdad

It has been found if your calorie deficit is too high, your body metabolism slows down. I would assume this applies whether you are eating way less and not exercising or exervising too much. I believe the potential to reduce metabolism happens when you start to go below 70% maintenance calories.

It's also seems widely accepted (at least based on the dozens of articles I've read) that optimum fat burn can be achieved by working out in the morning prior to eating breakfast when your glycogen stores are low. Otherwise the first 20-30 minutes of aerobic exercise burns glycogen instead of fat.

I find that I'm not very hungry in the morning. I'm wondering if fat loss can be increased even further by waiting until 10 AM to exercise (I go to bed about 11 PM and avoid eating food/carbs withing 3 hours of bedtime). Granted my energy level is lower as my blood sugar is low, but my workouts are not that intense (a combo of about 15-20 min resistance training and 15-20 min cardio) so I've found that fasting a couple extra hours doesn't effect my workout performance.

After my workout I eat a moderate breakfast that is semi-low carb to gradually raise my blood sugar, then about 2 to 2-1/2 to 3 hours later I eat lunch with more carbs in it and eat snacks/meals every 2-3 hours for the rest of the day. I count calories to make sure I'm achieving at least 70% maintenance level. I also go low-carb for 3 days and high carb/high calorie the 4th day once a week (to keep metabolism up.)

Does anyone see a drawback of waiting until late morning, extending the fast 2 and sometime 3 hours to further deplete glycogen stores in order to achieve maximum fat burn? Would it even make a difference?