Periodic prolonged fasting involves at least two days of fasting or a fasting-mimicking diet, and can be done with varying frequencies from once a year to 20 times a year.

“And then periodic prolonged fasting instead is what we mostly work on, and it's very different, and it's not intermittent in the sense that it's not something that has to happen in any type of cycles, frequent cycles. It can be done once a year, it can be done 10 times a year, it can be done 20 times a year, and it refers to let's say at least 2 days of fasting or longer, or 2 days of a fasting-mimicking diet or longer.”