Microbes and man have much in common. They live in harmony with each other for the benefit of both. Microbes have an influence on our behaviour, and we, as human beings on theirs. This symbiosis is sometimes disturbed which may lead to diseases such as irritable bowel syndrome and obesity. On top of these physical influences, there are spiritual ones, governed by our energetic fields. This book discusses both aspects of our living together and how we can learn from them to increase our chances for survival in a changing environment.