Is Healthy Behavior Contagious? Enthusiasm and lack of enthusiasm are life's two most contagious things. Is healthy living contagious? Insight: Your answers to rare questions are a key indicator to the depth of your belief system. Next Blog By jeff noel Retired Disney Institute Keynote Speaker and Prolific Blogger. Five daily, differently-themed personal blogs (about life's 5 big choices) on five interconnected sites. View all of jeff noel's posts.