This has been my personal experience. Things go strongly ketogenic around day 3. It’s an experience worth having at least once in your life, even if you’re no

This has been my personal experience. Things go strongly ketogenic around day 3. It’s an experience worth having at least once in your life, even if you’re not interested in a ketogenic diet. The longest I’ve fasted is 7 days, and things felt quite a bit different between day 2 and day 4.