Fat burning results in a significantly higher ratio of FADH2 to NADH compared to carbohydrate burning.

“running on glucose which is almost pure uh nadh generating it does a little obviously we know there's a little bit of fdh2 from substrate dehydrogenase but the bulk of it goes through complex one the electron transport change and that when you start to look at facts then it depended on your fact but the bottom line is i started off with palmitate because mathematics is easy and it becomes easy — and it turns out that it makes um not quite um not not quite um and 0.5 ratio between fdh2 and nadh”