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yeah, I dunno. I'm not a nutritionist/sports scientist/ anything so I can't claim to know what's going on, I would just say that in my experience the changes can be quite slow coming so if you want to try and do it I would commit for a good few months, maybe at least 6 and expect fasted performance to not be what you're used to (as you have no glycogen or whatever it is stored)
Also these days if I am planning ie a big ride or whatever, I just eat breakfast, but that's maybe 1ce a fortnight or so.
I just kept them up. Was hard going for a long time though, felt like I had no top end, could only plod along and anything more than that spiked my heart rate, did a lot of base miles.
Seems to have stopped now after a year and can do "speed work" etc again, but I'm also doing less in general (no gym, no commute) so it's hard to say for sure.