Do you seem to catch colds or the flu easily? Are you resigned to the fact that you are just "one of those people" that is naturally prone to infection and illness? Maybe you regularly plan for getting sick a few times each year when the seasons change. Guess what? Your family tree and genetic makeup deserve only a small amount of influence over your immune system. That means it is possible to give your body's natural level of immunity a boost. You really can start fighting off unhealthy and dangerous bacteria, viruses and germs, simply by making some lifestyle changes. And this is true whether you are young or old, male or female, and regardless where you live in the world. In this book, we explore some fitness and diet adjustments you can make that can power up your immune system, thus keeping you healthier year-round.