"Health in general starts in the gut. A healthy body starts with a healthy gut, and too many people are unhealthy because of an unhealthy gut. It’s easy to think of the skin as the body’s barrier to the outside world, but so is the gut.
The gut allows us to interact with the environment (which includes food), taking in what is necessary and beneficial and keeping out (hopefully) what might be unnecessary or harmful.
Now, modern science has shown us that weight control, mood, depression and other mental disorders are also connected to the gut (the second brain). Even chronic diseases such as diabetes, heart disease, cancer, etc. can be traced back to the gut.
Everything starts in the GI."