collegechemistrystudent said:
You can't burn as much fat in the beginning as you can later. You first have to get your slow twitch muscles in better shape, by increasing endurance gradually. Once they are stronger, you can burn a lot more calories in your workouts. Do not overdo it in the beginning or you will shed a lot of muscle.
This is actually pretty correct. The only way that you can switch your body over into burning fatty acids for energy is through endurance training. However, the training-induced shift in fuel selection from carbohydrates to fatty acids is prevented when a carbohydrate rich diet is consumed. Consuming carbohydrates either right before or during your workout will also prevent fatty acid usage as the increase in arterial plasma insulin prevents LCFA use by the body. Also, if you do short, high intensity workouts, your body will utilize glucose and not fat.
So, you basically have to workout for a couple of hours at low intensity while also consuming a low carbohydrate diet (before and during your workout) to truly get your body to utilize your fat stores.