A friend says one can literally feel when one’s fat is burning as a result of exercise. She describes it–and says everyone athletic describes it–as a tingling, itching feeling.
I wish to call BS on this claim. But I’ve been surprised before. So I lay this claim as a sacrifice at the altar of the SDMB gods. Is the sacrifice acceptable? Are the fumes pleasing to you?
No, that tingle sensation has nothing to do with fat burning.
She should drink more water - sounds like acidic sweat to me. . . 
How is one supposed to be able tell that those sensations are actually due to fat burning? I’m a long distance runner and I’ve never had a moment when I felt “Ah yes, that is fat being converted into energy”. A tingling, itching feeling could be from anything - skin tingles, sweat can make you itch, feet can feel “pins and needles”, clothing can rub you, muscles strain and ache.
I’m certainly aware that fat is being burned on my long runs but I don’t know if there’s any special physical sensation associated with it.
Hitting the wall. 
Is pain the feeling of weakness leaving the body?
I do notice something when I go on walks, about 25-35 minutes in, that I’ve attributed to aerobic burning kicking in. A sensation of altered blood flow in my diaphragm and rib area.
Pain is an unpleasant stimulation of the nerve endings. Weakness leaves the body through the head.
I can’t. I’ve burned 21 pounds of fat this year, and I didn’t feel one calorie of it going. I’ve been working really hard on gardening, doing hours of digging in a day, and I’ve felt hungry, thirsty, tired and sore from it, but I didn’t feel fat being turned into energy.
That’s silly.
If she could feel ‘fat burning’ she’d feel it all the time - any of the calories you consume daily that aren’t immediately used are stored in your fat cells until you need them. Our fat cells are constantly storied and releasing energy…
I feel that too itching and tingling sometimes too. But it seems to be the early stage of chafing, not fat burning.
I found for me tingling indicates I’m not breathing correctly. If I stop and take a few deep breaths the tingling goes away immediately.
This doesn’t happen much anymore. It happened a lot when I first got asthma, and until I worked enough to build up my tolerance.