Kind of off topic but wanted to see if anyone from HN has struggled with horrible brain fog while fasting and if they were able to overcome it? I can't fast more than 16 hours it seems without becoming dysfunctional.
For me, this went away after a fortnight or so. I also find that if I fall off of my routine, when I restart with a decent fast (72 hours or so) it eliminates this adjustment period. Kicks the body into keto
You may not be getting enough electrolytes, especially salt. Try drinking broth, taking a salt tablet, or adding some salt to your water. For me, the brain fog lifts within half an hour of taking salt.