It wouldn't be as effective as intermittent fasting meaning more frequent, shorter fasts. Eat an early dinner one day and nothing the next day until dinner time and have a large meal. Then have a normal day, and then another fast day. This can be done a few times a week all year round. Generally the more time we spend not digesting, the more repair we get done so it doesn't have to be this big 3-day event. We're also fully functional and nutritionally sufficient the whole time.
Stabbing conventional wisdom in its face.
Anyone who wants to talk nutrition should PM me!