Its funny...people argue constantly about where the fuel for A.M. cardio comes from, but ultimately it doesnt matter. What matters is creating a calorie deficit...and that happens WHENEVER you do cardio. Better to do AFTER a meal, so as not to deplete glycigen stores too far to create a catabolic state.
The key to recovery is having replenished/full glycogen stores, low glycogen storage will put your body in a catabolic state. thats why its BREAK fast.
Its naive to think that low glycogen (not eating) stores makes your body burn fat as the prefered choice of fuel....then NOT eating at all will make sure that your body will only burn fat for fuel. Then, all those poor starving people in the desert are precontest gurus now!
The ETHIOPIAN Precontest diet!
your not going to burn bodyfat food in your body, or glycogen stores. the only way you will burn body fat is by making your body function with out these nutrient stores. then it will use itself for energy. that is the only way to lose body fat....to use it for energy.
heres a deductive argument to show you what i mean..
-the only way to lose bodyfat is by making your body use the bodyfat for energy.
-the only way your body will use bodyfat for energy is when it is asked to function when there are energy source alternatives(zero calories present, zero glycogen stores) other than body fat.
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thus, the only way to lose bodyfat is by asking your body to function at a time when there is no other alternative source of energy other than body fat. (zero calories present, zero glycogen stores).
a caloric defecit diet achieves bodyfat loss only because it makes this state of no-other-available-energy-source occur by means of feeding your body less nutrients than it actually uses in a day. thus, there are times in the day when there are zero nutrients available, and ti must function off of itself. the same thing as in the morning, when you do cardio on an empty stomach.
you work so hard all day creating these small windows of 'starved cardio" when on a caloric defecit iet....why not take advantage of the morning starvation and burn up way more fat than you ever could during those small windows in the day.