The body's immune system is a complex network of interactions that take into account hormones, neurotransmitters, physical health, emotional state, psychological state, environmental stress, emotional stress and emotional intelligence. By developing better physical, psychological and emotional habits we give our immune system every possible chance to better manage external threats and successfully resist them. There is a lot of science behind each of the five steps shown here. The practical side of them however is simple. Apply them and reap the benefits.