Every day your gut is keeping you healthy. Like it or not, millions of healthy bacteria live throughout your GI tract, and they help you digest everything you eat. The healthier they are, the healthier your own cells are; the healthier your cells are, the stronger your immune system will be. Introducing dangerous chemicals and fatty foods slow down the digestive process, inflame your cells and - most dangerously - create an environment in which cells can mutate and start to function abnormally. That's why cancer is likely to grow in people with poor diets and unhealthy lifestyles.