Microbes are important to us in everyday life for lots of reasons. One of the main areas in which we benefit from their existence and behaviour is in food. Foods such as vinegar, olives, yoghurt and processed meats all rely on the action of microbes to make them palatable, nutritious and suitable for human needs. This program examines the positive use of microbes in foods using four main examples to illustrate their function in the food manufacturing process - they are bread, beer, cheese and salami. But their usefulness does not stop with manufacturing - some microbes are critical to the nourishment of the human body.