Nope. Not true. You're better off working out when you feel most energetic-- which is usually, a little while after eating your first meal (typically, later in the day = more need for sleep = less energetic workout)
You can burn your breakfast off while it's in your blood stream, or while it's stored fat. Doesn't make a difference other than that while it's in your blood stream it's more readily available to be used.
What happens to energy you digest... it gets broken down into glycogen --> put into your blood stream ---> if it isn't used up it gets stored as fat
So whether you burn 500 calories then eat 500 calories.. or eat 500 calories then burn 500 calories.. doesn't matter. For some reason people like to say, oh well if no food is in your system you're burning fat! Well, that's a bit misleading. Under that same scenario, if you don't exercise after you eat, then it all turns to fat. See how it's a mute point? People who say this, don't truly know what they're saying since it's misleading.
Your body maintains sugar levels in the blood stream, it's a balanced system.. when there is too much energy in the blood stream it stores some as fat.. when there isn't enough, it breaks down fat and increases glycogen levels in the blood.
SCENARIO A:So say you have 35,000 calories of stored fat, 500 in your bloodstream and you're gonna eat 500 calories this morning. You workout and burn the 500 calories in your bloodstream, your body replenishes your sugar levels so now your composition is: 34.500 calories of stored fat, and 500 in your blood stream. You now eat your 500 calorie breakfast and your bloodstream spikes to 1000 calories of energy in it. However, your body doesn't like this so it releases insulin and starts converting 500 calories of that energy to fat. You're now back at 35,000 calories of stored fat and 500 in the blood stream
SCENARIO B: You eat first and that puts you at 35.000 calories of stored fat and 1,000 calories in your blood stream.. your body releases insulin, 500 gets turned to stored fat (you now have 35,500 fat stores and 500 in blood stream). Then you workout and burn 500 calories. You now have 35,500 calories in fat stores and 0 in the blood stream. Your body converts again to establish balance and you now have 35,000 calories of stored fat and 500 in the bloodstream.
As you can see, it makes no difference which option you take in terms of "well if you do it before you eat you're burning fat"
However, proven studies show you can burn more calories with an energy spike, in most cases, since it allows for high intensity bursts of energy. So in reality in scenario B you would likely burn 550-600 calories and thus achieve better results. Working out on an empty stomach is not scientifically better, quite the opposite actually.
As far as working out in the morning, afternoon, or night.. it depends when you are at your highest energy levels. Typically this is in the morning or afternoon for most people.
sleep mode...no such thing
but the part where the body burns more fat while walking in the morning without eating is true since your body is starving from not eating while you were asleep
so your body will use your fat reserves as a source of energy
There really is no scientific basis for it.
It is best to workout when you have the most energy- for most people this is around noon.
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research on this subject is pretty torn. there's just as much scientific testing to prove this right as there is to prove it wrong. at the end of the day there is no "best time" to do cardio. do it whenever is easiest for you.
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