Even regardless of training, if you have low serotonin levels to begin with, you are going to be fucked with no or low carbs. Serotonin is a very important important hormone. Perhaps funnily enough, it IS the will power/self confidence neurotransmitter.
When you manage to get your serotonin too low (which would very likely happen to most people on no or low carb diets), expect these symptoms among others:
You'll be cold all the time (serotonin regulates body temperature), you'll be (even more so) hungry all the time, irritated, down, anxious, aggressive, fatigue, no energy, worrying, guilt, whole body aches including joints and muscles, headache, ...
There's no way to will power yourself through this, you will be completely miserable. Stimulants deplete serotonin even further eventually so those will make it even worse. All this for something that could just as well have been done with plenty of carbohydrates.
You may have very high serotonin levels naturally or just be a complete Rambo Onetimehard (or both). Either way, congrats on pulling it all off. I can't see too many people doing it.