Short answer: no. Long answer: The short answer is that you can’t use 16/8 intermittent fasting to get into ketosis. Although all mammals and many plants eat by a 24-hour day/night schedule, they also vary from one another. Some have 24 hours of fasting, some have 24 hours of feeding, and some have a period of fasting at least 24 hours out of every 24-hour period. We, humans, are no exception. We eat by an 8-12 hour day/night cycle, sometimes more often. We have eight periods of fasting, roughly at 24-hour intervals, before our next feeding. Now, those eight periods are not evenly spaced. They are not 16/8. But in general, 8-12 hour fasting periods are common, and we’ll use that to describe what we do.