How does the immune system works? The immune system consists of organs, cells, tissues, and proteins. Together, they carry out bodily processes to fight off pathogens and does a remarkable job of defending you against disease-causing microorganisms. But sometimes it fails- a germ invades successfully and makes you sick. Try a few lifestyle strategies to make your immune system stronger: - Eat a diet high in fruits and vegetables - Exercise regularly - Maintain a healthy weight - Get adequate sle