Co-dependency has become one of those buzzwords for our modern culture. Most of us use the term to describe someone who suffers from alcoholism or drug addiction. Therefore, when we think of co-dependency, we tend to think of programs like AA.
Breaking Free of the Co-dependency Trap states that possibly 98% of the human population is co-dependent. It's not lack of self control. It's not a disease. It's not even about the alcohol, the drugs, the food, or the people pleasing behaviors.
Co-dependency is merely the way that the mind attempts to adapt to its experiences. In the first six months of life, babies are meant to learn that the world is a safe loving place and that his or her parents will always keep them safe. Once they are assured of these facts, then they can start to explore the world in an increasingly independent way.
Unfortunately, parents aren't perfect. The majority don't even know how to give this sort of unconditional love. Most are too busy worrying about day to day concerns. So for most people, their psychological development gets stuck and they spend the rest of their lives trying to gain (or dampen the need for) that love, acceptance, and security. When they have children, their children continue the same cycle.