What feature does the digestive and excretory system have in common?
Some people refer to the digestive and excretory system as the GUT. Food and water go in one end of a long tube. Then the GUT extracts what our bodies need for fuel, and excretes what we do not need.
Many people believe that the GUT is not happy when we use lots of refined sugar, and other highly processed foods and lots of meat,. When this happens, the GUT tries to tell us we need to change what we are eating. But, most people do not get the message. When the GUT receives mostly unprocessed foods, including fruits and vegetables, it IS happy, and we feel better.