Funny you should ask that mate, I've always run fasted since I started, just a black coffee and then gone, but for the last two weeks I've been trying having some food before, had to really force myself to eat at first but I'm getting a bit better.
I've just been having an oaty breakfast bar but they do seem to be helping as I am finding more energy from somewhere although that could be from my slowly improving fitness hard to tell tbh.
Another thing I've changed lately is having a protein rich recovery shake with oat or almond milk straight after, thats having a big effect, protein was one thing I had not tried and think I definitely should have sooner, i used to have a homemade smoothie with spinach beetroot bananas berries etc, it gave me energy alright but also left me feeling jittery and quite weak, the protein seems to be having the opposite effect, I reckon my body was probably eating itself alive after a run.