First of all, you should know what keeping in good health is and let nature take its course, which means that everything in the world should follow nature and let nature take its course. If; If you go against nature, you can't talk about health, so; Nature is the highest state of health.

For example; People go to work during the day and rest at night, just let nature take its course. If; It is against nature to rest during the day and work often at night, so people will get sick sooner or later. So; This is let nature take its course, and let nature take its course is the highest state of health preservation. Am I satisfied with this explanation?