I was doing an extreme version of IF based on rodent research (adapted for human metabolism). I alternated 12 hours of eating as much as I like (2000-4000 cals) and 36 hours of complete fasting (just water/calorie free drinks, though at one point I'd eat around 50-100cals during my fasting period bc I was on a med that had to be taken with food). It was both stressful and oddly peaceful. The physical/health benefits were amazing (other than constipation) but it made socialising awkward. Not bc I minded being around food while fasting, but I received a ton of judgement and just going out to eat when I couldn't wasn't very fun.