It is the ideal playground for the lifestyle hacker.
i take your "beats me" doctors and raise you the gastroenterologist i saw recently - he said straight out, end of discussion, "our infectionist doesn't believe in candida in the gut"
As we have that saying in Russia - "the duty to save the drowning person lies solely with the drowning person" ("spasenie utopayuschih delo ruk samih utopayuschih")
You may be on to something. Many religions in times of prayer also have fasting and special diets. Such a large change in diet would influence gut bacteria and the person would attribute the change to their god.