“ Why not full fast?”
Side effects and risks of a full fast are much worse. The added risks and suffering are not worth it, since the benefits can be achieved in a safer and easier way.
A full fast shuts down bowel movements, which can cause autotoxemia. Also, critical mineral or electrolyte imbalances can occur in some people from a full fast. Sleep suffers a lot more during a full fast.
Having done both, I can report that the fast mimicking diet is a lot more comfortable, and it is much easier to keep working through it.
I fasted over 200?days a year for almost 3 years. My doctors said all systems were go. No negative effects were detected.