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Anonymous
OP, it is possible, but you need to be extremely precise in the timing of your meals and the intensity of your fat loss exercise... more precise than you're likely able to achieve.
For optimal fat loss, you don't want your aerobic exercise to be too intense. Around 50% VO2Max, your body's most efficient energy source is its own fat. Just a little higher than that, it starts using protein, which will inhibit or negate the muscle gain you're working on. As you approach 100%VO2Max, your cells switch to glycogen, which comes from the carbohydrates in your diet.
This is why carbs are considered 'bad' by people who don't do much high-intensity aerobic exercise-- their bodies rarely get to a place where carbohydrate metabolism is particularly efficient.
Unless you go to a sports physiologist for some very intense and expensive tests, you're never going to know what your VO2Max actually is. But jogging-wise, if your breathing is too heavy for you to talk, then you've likely gone past ideal fat metabolism point and you're burning up carbs and protein.
This is a slooow process, by the way. At low intensity, you may be burning a higher percentage of calories from fat, but you're also burning a LOWER total amount of calories. This means your jogs have to be slower and longer.
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