What Is Intermittent Fasting?

What do you think qualifies intermittent fasting? How many hours do a person need to fast to be called intermittent fasting?

So this is a big problem in the fasting research field as a whole, is that there's so many different definitions of intermittent fasting. And you can see when you dive into the literature, that there are certain lengths of fasting that we call intermittent fasting, but really don't offer much additional benefit beyond caloric restriction. So, biochemically speaking, in order to really enter into fasting metabolism, you have to go for about 20 to 24 hours without food, and that's just to start entering into true fasting metabolism. And that's because it takes around 20 to 24 hours for your body to deplete its glycogen stores. So all the stored carbohydrates in your body. And then after that, you're going to have this metabolic switch from carbohydrate metabolism to lipid metabolism and ketone production.