I don't know 100% for sure, but I think this may have more to do with how many calories you're eating over time total vs how much you eat near exercising. A cal

I don't know 100% for sure, but I think this may have more to do with how many calories you're eating over time total vs how much you eat near exercising. A caloric deficit on its own will do all the things you've named regardless of feed windows, and I haven't experienced any of them while intermittent fasting. But I can't say for sure if I've ever had 2+ hours heavy exertion while doing IF.