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Yes, indeed. In the past I've been in the habit of running long runs on empty, which was fine most of the time but occasionally, particularly on warm days, my sweat would get an ammonia whiff to it, which always coincided with me feeling a little light-headed.
As for early morning sessions, I agree that fueling shouldn't be an issue since you're not doing great volume. Plenty in the tank from the night before. Not a big fan myself as I'm not the best in the morning and I like to get my loo stops sorted! (Parkrun is early enough for me, and then it's up at 7.15, single slice of toast and a coffee...)
PhilPub
I've never experienced it but my wife has whilst marathon training but smelling Ammonia is meant to be a sign of under fueling as your body's going catabolic. I read an article at the time so will try to dig out. Anyone else had or heard of this?
EDIT: found it
https://www.runnersworld.com/health-injuries/a20788991/burning-protein-as-fuel/