The gastrointestinal system (GI) runs your life, especially when aged. Colon health is part of physical health and fitness. It is a major factor in energy, endurance, strength, balance, mental alertness and pain-free movement. It is a major factor in life viability. The GI system impacts heart function. It can change the heart rhythms and speed according to the vagus nerve. It could stop the heart if it is under severe stress. Taking care of the GI and its nervous system can improve physical, mental and emotional aspects of life as age. It can lengthen life and make it more enjoyable.