In this must-read book, immunologist Leo Nissola provides a comprehensive overview of your body's defences, revealing what can cause problems, how to recognise warning signs and how to fight back. Every day, bacteria, viruses and other germs attack you, but you stay healthy most of the time. While you can't live forever, there's more to fighting disease than you might think, including diet, lifestyle habits and environment. Nissola explains why improving your natural defences should be at the top of your health priorities, and he details the cutting-edge treatments that researchers are developing to hack the immune system. He explores the latest science on immune-boosting diets, supplements and longevity while debunking myths about antibodies, inflammation and why some people rarely get sick. Featuring an easy, step-by-step program, this information-packed handbook will help you support your body's defences, ward off ageing and maximise your health every day.