1. For me, I never really experienced brain fog while IF. If anything, I seem to get more fog after eating regular/larger meals. When I was really hungry, drinking water and/or coffee (Starbucks double shots) worked for me. After a while you get used to hunger, and I seem to work better when I’m hungry vs when I’ve eaten a typical meal. If I’m seriously so hungry I’m getting a headache (which happens) id only have something with protein, absolutely no carbs (i.e lunch meat, eggs, nuts)
2. Don’t have too much knowledge or experience on gallstones. I took fish oil supplements occasionally and cut out creatine, but that’s about it.
3. Not 100% sure based on wording, but I was doing IF for about 6 weeks and lost ~20lbs. I ate from 6pm to 10pm, slept typically 1am to 7-8am. Only coffee and water during the day.
Now at 180lbs and not on IF or a strict IF schedule, I typically just have coffee in the mornings, a light lunch if I eat, and a typical dinner. 30 mins cardio 2-3 days a week, compound lifts 2-3 days a week.
Source - mid 20’s software developer