I did overnight oats with banana and peanut butter, honey or dark chocolate chips. just a few spoons of it before training amd then eat a meal after.
I don’t know if it’s good or bad but I worked well for me.
Healthy fats like avocado, nuts, nut butter, seed/olive/avocado oil, olives.
Protein (eggs, protein shake, legumes, meat…).
Pre- and probiotic foods like yoghurt, fermented foods like Sauerkraut or Kimchi, seeds and seed oils.
I would break the fast with a piece of fruit to get the stomach ready for food. Not anything heavy straight away, start with just like a small fruit appetizer say a banana or two which I’ve done before the meal which yesterday was a big bowl of cooked spinach with some seafood and seasonings. I’m about to eat right now, first time 20 hour fasting completed