I can see how this would make a nice movie. There are some humorous scenes in it for sure. But the author became extremely redundant. Yes, I get it that the patients at Dr. Kellogg's sanitarium undergo enemas multiple times per day, have starvation-level vegetarian diets prescribed to them, are forbidden to have sex, and engage in many other unorthodoxed treatments. After half the book was over, these facts were being rehashed over and over and over when the author could have just resolved the book.
I rarely ever say this, but:
Watch the movie. Skip the book.