My moment came when DH and I were discussing having our first child and I froze in horror at getting pregnant at my current weight. Would I put myself and my child at risk? How much would I gain and how difficult would it be to lose? Will I be able to play with my child and not be out of breath? Will I be able to fun stuff with my kids without feeling embarrassed...trips to Disney World etc. So, my defining moment was love for a child that I am yet to conceive