I sometimes intermittently fast for 24 hour periods, but recently I've switched to skipping breakfast, which effectively works out to be a 17 hour fast for me if I eat dinner at 6pm and have lunch at 12pm. Everyone says it's the most important meal of the day, but I haven't found convincing evidence of this(especially that which isn't sponsored by grain and sugar producers), and not having a huge insulin spike at the beginning of the day seems beneficial.

The results are profound. I'm a lot more focused and emotionally stable. The only distraction is the frequent "gotta find food" feeling, but that usually subsides within minutes. It's usually not even true hunger, but an impulse instilled in me by a culture focused on eating and "never starving".

Pro-breakfast proponents say that eating breakfast results in eating less throughout the day, but I can't say this has been true at all for myself. When I ate breakfast, I also would snack more throughout the day. Without breakfast, I look forward to meals more and those two meals, which are almost always ketogenic, are more satisfying.

The only negative effect I'm having is that my sex drive has plummeted to near-zero. I suppose that's a good thing for focusing on work, but I wouldn't want to keep that up forever.