True or false

I've never heard that before lol.

Wow, that just made my head hurt....knowing when I am burning what doesn't make a difference to me. I have a hard enough time keeping my heart in my target zone for 30 min and even then I don't know if I am doing it right...

Depends on the type of exercise, but...

Steady state cardio will follow a track largely like that (especailly if done in a fasted state). Your burn will shift to fat heavy once you've been doing it a bit to conserve carbs. You can usually feel this occur when running as it will get a bit harder (one of the reasons that mile 2 tends to be the hardest mile until you near your distance limit). The longer you've been running, the faster yoru body will make this shift. Some marathoners/ultramarathoners do low carb diets in order for there to be no shift.

That burning muscle bit though is a bit off. Muscle loss won't occur nearly that fast. 1.5-2 hours in, yeah it can be a concern. Not a lot of people are in good enough shape though to get to that territory, most will succumb to fatigue before that.

Most of the muscle loss blah blah crap comes from massaged research from supp companies that are trying to sell you BCAA's.

Depends on the type of exercise, but...

Steady state cardio will follow a track largely like that (especailly if done in a fasted state). Your burn will shift to fat heavy once you've been doing it a bit to conserve carbs.

Let me get this straight, I am a walker, walking is all I have ever done and currently do, I walk a pretty regular 3 MPH pace. So, if I understand what you are stating, I will ("should") be more successful at burning Fat by having walks that last longer than 20 minutes?

So walking 5 miles a day in 1 mile intervals taking 20 minutes each is not as effective as walking 5 miles in one session over 1 hour and 40 minutes, is that correct?

The time isn't really that important, what is important is that your carb supply starts going down a little fast, but your exercise is low-moderate intensity, so that your body can turn off the carb flow and power the exercise mostly on fat.

This is why the HIIT then LISS schemes exist, do a few minutes of high intensity cardio to rapidly burn up carbs, then switch to low intensity and burn almost purely fat. The HIIT will cause the body to switch over to mostly fat burn quicker.

If you are losing weight, whether the burn comes from fat or carbs is irrelevant. If you burn more fat when walking, that just means you have more carbs to burn and burn less fat the rest of the day, in the end you end up burning whatever your calorie deficit is in fat.

As it relates to weight loss, this is very much a case of undo investigating of trees, whilst ignoring the forest they are in. Crazy exercise schemes are not going to cause you to lose fat faster than your deficit allows.

All the research that shows this effect is absolutely meaningless for weight loss. Trying to apply the data to weight loss is misguided at best. The deficit governs.

Now applying that information to maintenence and/or a surplus is a very different story, especially a surplus.