Most people do not need to be told that a car requires high-quality fuel and that it needs to be taken to the workshop regularly for scheduled inspections. Only in this way can one enjoy their vehicle for a long time. However, when it comes to the fuel for their own body, or the regular check-ups (preventive examinations), many people show rejection or ignorance. Carbohydrates, fats, and proteins are the basis of our nutrition, just as crude oil is the basis of gasoline. However, it is the refinery that transforms oil into gasoline. For an engine to utilize these raw materials, additives must be included. The same applies to our diet. The stomach can be seen as a refinery. The additives are the vital substances (vitamins, minerals, and trace elements). For a long time, little was known about them.