It seems to me you'd want to make some adjustments to types and amounts of calories to account for exercise, especially anything very taxing, like endurance training. But I haven't found any advice on this specific topic.
I don't really fast on purpose but I mostly eat one large meal a day (dinner). I workout in evenings before dinner.
I do snack if I get hungry maybe around 4PM. My snacks are usually Lay's chips. Sometimes, I get a Gatorade for gym.
I can lift about as heavy as if I had a big lunch but cardio is different story. If push myself as hard as one days when I had lunch or a lot snacks, I will start to see stars. I go a lot slower with cardio then. (Seeing stars or vision going white is sign of sudden drop in blood sugar level).
This worked really well for me.
Calculate your TDEE (Total Daily Energy Expenditure) in a purely sedentary state. Then eat more than that on the days you exercise to compensate for the energy you burned.
That assumes your goal is to maintain your current weight.